[1] K E ECHTERNKAMP, A FEIST, S SCHAFER et al. Ramsey-type phase control of free-electron beams. Nature Physics, 12, 1000-1004(2016).
[2] R J D MILLER. Femtosecond crystallography with ultrabright electrons and X-rays： capturing chemistry in action. Science, 343, 1108-1116(2014).
[3] A H ZEWAIL. Four-dimensional electron microscopy. Science, 328, 187-193(2010).
[4] T FRIGGE, B HAFKE, T WITTE et al. Optically excited structural transition in atomic wires on surfaces at the quantum limit. Nature, 544, 207-211(2017).
[5] L KASMI, D KREIER, M BRADLER et al. Femtosecond single-electron pulses generated by two-photon photoemission close to the work function. New Journal of Physics, 17(2015).
[6] R BORMANN, S STRAUCH, S SCHÄFER et al. An ultrafast electron microscope gun driven by two-photon photoemission from a nanotip cathode. Journal of Applied Physics, 118(2015).
[7] J HOFFROGGE, J P STEIN, M KRUEGER et al. Tip-based source of femtosecond electron pulses at 30 keV. Journal of Applied Physics, 115(2014).
[8] R P CHATELAIN, V R MORRISON, B L M KLARENAAR et al. Coherent and incoherent electron-phonon coupling in graphite observed with radio-frequency compressed ultrafast electron diffraction. Physical Review Letters, 113(2014).
[9] A GLISERIN, M WALBRAN, F KRAUSZ et al. Sub-phonon-period compression of electron pulses for atomic diffraction. Nature Communications, 6, 8723(2015).
[10] J MAXSON, D CESAR, G CALMASINI et al. Direct measurement of sub-10 fs relativistic electron beams with ultralow emittance. Physical Review Letters, 118, 154802(2017).
[11] OUDHEUSDEN TVAN, P PASMANS, DER GEER S BVAN et al. Compression of subrelativistic space-charge-dominated electron bunches for single-shot femtosecond electron diffraction. Physical Review Letters, 105, 264801(2010).
[12] C KEALHOFER, W SCHNEIDER, D EHBERGER et al. All-optical control and metrology of electron pulses. Science, 352, 429-433(2016).
[13] C M S SEARS, E COLBY, R ISCHEBECK et al. Production and characterization of attosecond electron bunch trains. Physical Review Special Topics-Accelerators and Beams, 11(2008).
[14] M KOZAK, T ECKSTEIN, N SCHONENBERGER et al. Inelastic ponderomotive scattering of electrons at a high-intensity optical travelling wave in vacuum. Nature Physics, 14, 121-125(2018).
[15] P BAUM, A H ZEWAIL. Attosecond electron pulses for 4D diffraction and microscopy. Proceedings of the National Academy of Sciences of the United States of America, 104, 18409-18414(2007).
[16] Y MORIMOTO, P BAUM. Diffraction and microscopy with attosecond electron pulse trains. Nature Physics, 14, 252-256(2018).
[17] M KOZAK, J MCNEUR, K J LEEDLE et al. Optical gating and streaking of free electrons with sub-optical cycle precision. Nature Communications, 8, 14342(2017).
[18] K E PRIEBE, C RATHJE, S V YALUNIN et al. Attosecond electron pulse trains and quantum state reconstruction in ultrafast transmission electron microscopy. Nature Photonics, 11, 793-797(2017).
[19] T PLETTNER, R L BYER, E COLBY et al. Visible-laser acceleration of relativistic electrons in a semi-infinite vacuum. Physical Review Letters, 95, 134801(2005).
[20] B M COWAN. Two-dimensional photonic crystal accelerator structures. Physical Review Special Topics-Accelerators and Beams, 6, 101301(2003).
[21] L SCHäCHTER, R L BYER, R H SIEMANN. Wake field in dielectric acceleration structures. Physical Review E, 68(2003).
[22] E A PERALTA, K SOONG, R J ENGLAND et al. Demonstration of electron acceleration in a laser-driven dielectric microstructure. Nature, 503, 91-94(2013).
[23] A M MICHALIK, J E SIPE. Evolution of non-gaussian electron bunches in ultrafast electron diffraction experiments： comparison to analytic model. Journal of Applied Physics, 105(2009).
[24] T V OUDHEUSDEN, E F D JONG, S B V D GEER et al. Electron source concept for single-shot sub-100 fs electron diffraction in the 100 keV range. Journal of Applied Physics, 102(2007).
[25] J C WILLIAMSON, J CAO, H IHEE et al. Clocking transient chemical changes by ultrafast electron diffraction. Nature, 386, 159-162(1997).
[26] H IHEE, V A LOBASTOV, U M GOMEZ et al. Direct imaging of transient molecular structures with ultrafast diffraction. Science, 291, 458-462(2001).
[27] J CAO, Z HAO, H PARK et al. Femtosecond electron diffraction for direct measurement of ultrafast atomic motions. Applied Physics Letters, 83, 1044-1046(2003).
[28] B J SIWICK, J R DWYER, R E JORDAN et al. An atomic-level view of melting using femtosecond electron diffraction. Science, 302, 1382-1385(2003).
[29] L WALDECKER, R BERTONI, R ERNSTORFER. Compact femtosecond electron diffractometer with 100 keV electron bunches approaching the single-electron pulse duration limit. Journal of Applied Physics, 117(2015).
[30] S CARBAJO, E A NANNI, L J WONG et al. Direct longitudinal laser acceleration of electrons in free space. Physical Review Accelerators and Beams, 19(2016).
[31] P ZHU, Y ZHU, Y HIDAKA et al. Femtosecond time-resolved Mev electron diffraction. New Journal of Physics, 17(2015).
[32] P F ZHU, F C FU, S G LIU et al. Time-resolved visualization of laser-induced heating of gold with mev ultrafast electron diffraction. Chinese Physics Letters, 31, 116101(2014).
[33] S P WEATHERSBY, G BROWN, M CENTURION et al. Mega-electron-volt ultrafast electron diffraction at slac national accelerator laboratory. Review of Scientific Instruments, 86(2015).
[34] R LI, W HUANG, Y DU et al. Note： Single-shot continuously time-resolved MeV ultrafast electron diffraction. Review of Scientific Instruments, 81(2010).
[35] J YANG, K KAN, N NARUSE et al. 100-femtosecond MeV electron source for ultrafast electron diffraction. Radiation Physics and Chemistry, 78, 1106-1111(2009).
[36] J B HASTINGS, F M RUDAKOV, D H DOWELL et al. Ultrafast time-resolved electron diffraction with megavolt electron beams. Applied Physics Letters, 89, 184109(2006).
[37] E FILL, L VEISZ, A APOLONSKI et al. Sub-fs electron pulses for ultrafast electron diffraction. New Journal of Physics, 8, 272(2006).
[38] X J WANG, D XIANG, T K KIM et al. Potential of femtosecond electron diffraction using near-relativistic electrons from a photocathode RF electron gun. Journal of the Korean Physical Society, 48, 390-396(2006).
[39] S LAHME, C KEALHOFER, F KRAUSZ et al. Femtosecond single-electron diffraction. Structural Dynamics, 1(2014).
[40] M AIDELSBURGER, F O KIRCHNER, F KRAUSZ et al. Single-electron pulses for ultrafast diffraction. Proceedings of the National Academy of Sciences of the United States of America, 107, 19714-19719(2010).
[41] C WANG, Y KANG. Double-mode electrostatic dispersing prism for electron pulse time-domain compression. Optik, 125, 6352-6356(2014).
[42] A GLISERIN, A APOLONSKI, F KRAUSZ et al. Compression of single-electron pulses with a microwave cavity. New Journal of Physics, 14(2012).
[43] M GAO, H JEAN-RUEL, R R COONEY et al. Full characterization of RF compressed femtosecond electron pulses using ponderomotive scattering. Optics Express, 20, 12048-12058(2012).
[44] R P CHATELAIN, V R MORRISON, C GODBOUT et al. Ultrafast electron diffraction with radio-frequency compressed electron pulses. Applied Physics Letters, 101(2012).
[45] S TOKITA, M HASHIDA, S INOUE et al. Single-shot ultrafast electron diffraction with a laser-accelerated sub-MeV electron pulse. Physical Review Letters, 95, 111911(2009).
[46] P BAUM, A H ZEWAIL. 4D attosecond imaging with free electrons： diffraction methods and potential applications. Chemical Physics, 366, 2-8(2009).
[47] P BAUM, A ZEWAIL. Femtosecond diffraction with chirped electron pulses. Chemical Physics Letters, 462, 14-17(2008).
[48] F O KIRCHNER, A GLISERIN, F KRAUSZ et al. Laser streaking of free electrons at 25 keV. Nature Photonics, 8, 52-57(2014).
[49] J YANG, M GUEHR, X SHEN et al. Diffractive imaging of coherent nuclear motion in isolated molecules. Physical Review Letters, 117, 153002(2016).
[50] V R MORRISON, R P CHATELAIN, K L TIWARI et al. A photoinduced metal-like phase of monoclinic VO2 revealed by ultrafast electron diffraction. Science, 346, 445-448(2014).
[51] M GAO, C LU, H JEAN-RUEL et al. Mapping molecular motions leading to charge delocalization with ultrabright electrons. Nature, 496, 343-346(2013).
[52] R ERNSTORFER, M HARB, C T HEBEISEN et al. The formation of warm dense matter： Experimental evidence for electronic bond hardening in gold. Science, 323, 1033-1037(2009).
[53] M T HASSAN, J S BASKIN, B LIAO et al. High-temporal-resolution electron microscopy for imaging ultrafast electron dynamics. Nature Photonics, 11, 425-430(2017).
[54] M T HASSAN, A MOULET et al. Optical attosecond pulses and tracking the nonlinear response of bound electrons. Nature, 530, 66-70(2016).
[55] H C SHAO, A F STARACE. Detecting electron motion in atoms and molecules. Physical Review Letters, 105, 263201(2010).
[56] V S YAKOVLEV, M I STOCKMAN, F KRAUSZ et al. Atomic-scale diffractive imaging of sub-cycle electron dynamics in condensed matter. Scientific Reports, 5, 14581(2015).
[57] G M VANACORE, A W P FITZPATRICK, A H ZEWAIL. Four-dimensional electron microscopy： ultrafast imaging， diffraction and spectroscopy in materials science and biology. Nano Today, 11, 228-249(2016).
[58] T CHASE, M TRIGO, A H REID et al. Ultrafast electron diffraction from non-equilibrium phonons in femtosecond laser heated Au films. Applied Physics Letters, 108(2016).
[59] A W P FITZPATRICK, G M VANACORE, A H ZEWAIL. Nanomechanics and intermolecular forces of amyloid revealed by four-dimensional electron microscopy. Proceedings of the National Academy of Sciences of the United States of America, 112, 3380-3385(2015).
[60] A H ZEWAIL. 4D visualization of matter：Recent collected works of Ahmed H Zewail， Nobel Laureate(2014).
[61] G SCIAINI, R J D MILLER. Femtosecond electron diffraction： Heralding the era of atomically resolved dynamics. Reports on Progress in Physics, 74(2011).
[62] R J D MILLER, R ERNSTORFER, M HARB et al. 'Making the molecular movie'： First frames. Acta Crystallographica a-Foundation and Advances, 66, 137-156(2010).
[63] A H ZEWAIL, J M THOMAS. 4D ultrafast electron imaging： developments and applications, 179-273(2010).
[64] A H ZEWAIL. 4D ultrafast electron diffraction， crystallography， and microscopy. Annual Review of Physical Chemistry, 57, 65-103(2006).
[65] B W REED. Femtosecond electron pulse propagation for ultrafast electron diffraction. Journal of Applied Physics, 100(2006).
[66] B J SIWICK, J R DWYER, R E JORDAN et al. Femtosecond electron diffraction studies of strongly driven structural phase transitions. Chemical Physics, 299, 285-305(2004).
[67] C T HEBEISEN, G SCIAINI, M HARB et al. Grating enhanced ponderomotive scattering for visualization and full characterization of femtosecond electron pulses. Optics Express, 16, 3334-3341(2008).
[68] M EICHBERGER, H SCHAEFER, M KRUMOVA et al. Snapshots of cooperative atomic motions in the optical suppression of charge density waves. Nature, 468, 799-802(2010).
[69] P BAUM, D S YANG, A H ZEWAIL. 4D visualization of transitional structures in phase transformations by electron diffraction. Science, 318, 788-792(2007).
[70] H PARK, X WANG, S NIE et al. Direct and real-time probing of both coherent and thermal lattice motions. Solid State Communications, 136, 559-563(2005).
[71] P MUSUMECI, J T MOODY, C M SCOBY et al. Laser-induced melting of a single crystal gold sample by time-resolved ultrafast relativistic electron diffraction. Applied Physics Letters, 97(2010).
[72] F FU, S LIU, P ZHU et al. High quality single shot ultrafast MeV electron diffraction from a photocathode radio-frequency gun. Review of Scientific Instruments, 85(2014).
[73] Y GIRET, N NARUSE, S L DARASZEWICZ et al. Determination of transient atomic structure of laser-excited materials from time-resolved diffraction data. Applied Physics Letters, 103, 253107(2013).
[74] R J D MILLER. Mapping atomic motions with ultrabright electrons： the chemists' gedanken experiment enters the lab frame. Annual Review of Physical Chemistry, 65, 583-604(2014).
[75] L SCHäCHTER, W D KIMURA, I BEN-ZVI. Ultrashort microbunch electron source. AIP Conference Proceedings, 1777(2016).
[76] H YANAGISAWA, C HAFNER, P DONA et al. Laser-induced field emission from a tungsten tip： Optical control of emission sites and the emission process. Physical Review B, 81, 115429(2010).
[77] P HOMMELHOFF, Y SORTAIS, A AGHAJANI-TALESH et al. Field emission tip as a nanometer source of free electron femtosecond pulses. Physical Review Letters, 96(2006).
[78] R E NEIDERT, P M PHILLIPS, S T SMITH et al. Field emission triodes. IEEE Transactions on Electron Devices, 38, 661-665(1991).
[79] B BARWICK, H S PARK, O H KWON et al. 4D imaging of transient structures and morphologies in ultrafast electron microscopy. Science, 322, 1227-1231(2008).
[80] P HOMMELHOFF, C KEALHOFER, M A KASEVICH. Reaching the resolved tunnel regime for a femtosecond oscillator driven field emission electron source. Laser Physics, 19, 736-738(2009).
[81] C ROPERS, D R SOLLI, C P SCHULZ et al. Localized multiphoton emission of femtosecond electron pulses from metal nanotips. Physical Review Letters, 98(2007).
[82] C ROPERS, T ELSAESSER, G CERULLO et al. Ultrafast optical excitations of metallic nanostructures： From light confinement to a novel electron source. New Journal of Physics, 9, 397(2007).
[83] B BARWICK, C CORDER, J STROHABER et al. Laser-induced ultrafast electron emission from a field emission tip. New Journal of Physics, 9, 142(2007).
[84] P HOMMELHOFF, C KEALHOFER, M A KASEVICH. Ultrafast electron pulses from a tungsten tip triggered by low-power femtosecond laser pulses. Physical Review Letters, 97, 247402(2006).
[85] B BARWICK, D J FLANNIGAN, A H ZEWAIL. Photon-induced near-field electron microscopy. Nature, 462, 902-906(2009).
[86] F CARBONE, O H KWON, A H ZEWAIL. Dynamics of chemical bonding mapped by energy-resolved 4D electron microscopy. Science, 325, 181-184(2009).
[87] V A LOBASTOV, R SRINIVASAN, A H ZEWAIL. Four-dimensional ultrafast electron microscopy. Proceedings of the National Academy of Sciences of the United States of America, 102, 7069-7073(2005).
[88] M AESCHLIMANN, E HULL, J CAO et al. A picosecond electron gun for surface analysis. Review of Scientific Instruments, 66, 1000-1009(1995).
[89] F BANFI, C GIANNETTI, G FERRINI et al. Experimental evidence of above-threshold photoemission in solids. Physical Review Letters, 94(2005).
[90] B ZEITLER, K FLOETTMANN, F GRüNER. Linearization of the longitudinal phase space without higher harmonic field. Physical Review Special Topics-Accelerators and Beams, 18, 120102(2015).
[91] A BUCK, M NICOLAI, K SCHMID et al. Real-time observation of laser-driven electron acceleration. Nature Physics, 7, 543(2011).
[92] O LUNDH, C RECHATIN et al. Few femtosecond， few kiloampere electron bunch produced by a laser-plasma accelerator. Nature Physics, 7, 219-222(2011).
[93] E ESAREY, C B SCHROEDER, W P LEEMANS. Physics of laser-driven plasma-based electron accelerators. Reviews of Modern Physics, 81, 1229-1285(2009).
[94] R J ENGLAND, R J NOBLE, K BANE et al. Dielectric laser accelerators. Reviews of Modern Physics, 86, 1337-1389(2014).
[95] Min CHEN, Feng LIU, Boyuan LI等. Development and prospect of laser plasma wakefield accelerator. High Power Laser and Particle Beams, 32(2020).
[96] M D PERRY, G MOUROU. Terawatt to petawatt subpicosecond lasers. Science, 264, 917-924(1994).
[97] D STRICKLAND, G MOUROU. Compression of amplified chirped optical pulses. Optics Communications, 56, 219-221(1985).
[98] S P MANGLES, C D MURPHY, Z NAJMUDIN et al. Monoenergetic beams of relativistic electrons from intense laser-plasma interactions. Nature, 431, 535-538(2004).
[99] C G R GEDDES, C TOTH, TILBORG JVAN et al. High-quality electron beams from a laser wakefield accelerator using plasma-channel guiding. Nature, 431, 538-541(2004).
[100] J FAURE, Y GLINEC, A PUKHOV et al. A laser-plasma accelerator producing monoenergetic electron beams. Nature, 431, 541-544(2004).
[101] A J GONSALVES, K NAKAMURA, J DANIELS et al. Petawatt laser guiding and electron beam acceleration to 8 GeV in a laser-heated capillary discharge waveguide. Physical Review Letters, 122(2019).
[102] W P LEEMANS, A J GONSALVES, H S MAO et al. Multi-GeV electron beams from capillary-discharge-guided subpetawatt laser pulses in the self-trapping regime. Physical Review Letters, 113, 245002(2014).
[103] S KNEIP, S R NAGEL, S F MARTINS et al. Near-GeV acceleration of electrons by a nonlinear plasma wave driven by a self-guided laser pulse. Physical Review Letters, 103(2009).
[104] N A M HAFZ, T M JEONG, I W CHOI et al. Stable generation of GeV-class electron beams from self-guided laser-plasma channels. Nature Photonics, 2, 571-577(2008).
[105] W P LEEMANS, B NAGLER, A J GONSALVES et al. GeV electron beams from a centimetre-scale accelerator. Nature Physics, 2, 696-699(2006).
[106] D GUéNOT, D GUSTAS, A VERNIER et al. Relativistic electron beams driven by kHz single-cycle light pulses. Nature Photonics, 11, 293-296(2017).
[107] K SCHMID. Few-cycle laser-driven electron acceleration. Physical Review Letters, 102, 124801(2009).
[108] M P TOOLEY, B ERSFELD, S R YOFFE et al. Towards attosecond high-energy electron bunches： controlling self-injection in laser-wakefield accelerators through plasma-density modulation. Physical Review Letters, 119(2017).
[109] V HORN, V PETRíLKA, M KRUS. Short electron bunches from injection by perpendicularly crossing pulses. Plasma Physics and Controlled Fusion, 61(2019).
[110] Q ZHAO, S M WENG, M CHEN et al. Sub-femtosecond electron bunches in laser wakefield acceleration via injection suppression with a magnetic field. Plasma Physics and Controlled Fusion, 61(2019).
[111] W SCHUMAKER, N NAKANII, C MCGUFFEY et al. Ultrafast electron radiography of magnetic fields in high-intensity laser-solid interactions. Physical Review Letters, 110(2013).
[112] C J ZHANG, J F HUA, Y WAN et al. Femtosecond probing of plasma wakefields and observation of the plasma wake reversal using a relativistic electron bunch. Physical Review Letters, 119(2017).
[113] A ROUSSE. Production of a keV X-ray beam from synchrotron radiation in relativistic laser-plasma interaction. Physical Review Letters, 93, 135005(2004).
[114] E ESAREY, B A SHADWICK, P CATRAVAS et al. Synchrotron radiation from electron beams in plasma-focusing channels. Physical Review E, 65(2002).
[115] R C SHAH, F ALBERT, KTA PHUOC et al. Coherence-based transverse measurement of synchrotron X-ray radiation from relativistic laser-plasma interaction and laser-accelerated electrons. Physical Review E, 74(2006).
[116] S KNEIP, C MCGUFFEY, J L MARTINS et al. Bright spatially coherent synchrotron X-rays from a table-top source. Nature Physics, 6, 980-983(2010).
[117] S KNEIP, C MCGUFFEY, F DOLLAR et al. X-ray phase contrast imaging of biological specimens with femtosecond pulses of betatron radiation from a compact laser plasma wakefield accelerator. Applied Physics Letters, 99(2011).
[118] S FOURMAUX, S CORDE, K T PHUOC et al. Single shot phase contrast imaging using laser-produced betatron X-ray beams. Optics Letters, 36, 2426-2428(2011).
[119] J M COLE, D R SYMES, N C LOPES et al. High-resolution μCT of a mouse embryo using a compact laser-driven X-ray betatron source. Proceedings of the National Academy of Sciences of the United States of America, 115, 6335-6340(2018).
[120] J WENZ, S SCHLEEDE, K KHRENNIKOV et al. Quantitative X-ray phase-contrast microtomography from a compact laser-driven betatron source. Nature Communications, 6, 7568(2015).
[121] B MAHIEU, N JOURDAIN, KTA PHUOC et al. Probing warm dense matter using femtosecond X-ray absorption spectroscopy with a laser-produced betatron source. Nature Communications, 9, 3276(2018).
[122] R KODAMA, Y SENTOKU, Z L CHEN et al. Plasma devices to guide and collimate a high density of MeV electrons. Nature, 432, 1005-1008(2004).
[123] H NAKAJIMA, S TOKITA, S INOUE et al. Divergence-free transport of laser-produced fast electrons along a meter-long wire target. Physical Review Letters, 110, 155001(2013).
[124] W WANG, J LIU, Y CAI et al. Angular and energy distribution of fast electrons emitted from a solid surface irradiated by femtosecond laser pulses in various conditions. Physics of Plasmas, 17(2010).
[125] G Y HU, A L LEI, W T WANG et al. Collimated hot electron jets generated from subwavelength grating targets irradiated by intense short-pulse laser. Physics of Plasmas, 17(2010).
[126] F BRANDL, B HIDDING, J OSTERHOLZ et al. Directed acceleration of electrons from a solid surface by sub-10-fs laser pulses. Physical Review Letters, 102, 195001(2009).
[127] Y T LI, X H YUAN, M H XU et al. Observation of a fast electron beam emitted along the surface of a target irradiated by intense femtosecond laser pulses. Physical Review Letters, 96, 165003(2006).
[128] M GULDE, S SCHWEDA, G STORECK et al. Ultrafast low-energy electron diffraction in transmission resolves polymer/graphene superstructure dynamics. Science, 345, 200-204(2014).
[129] E QUINONEZ, J HANDALI, B BARWICK. Femtosecond photoelectron point projection microscope. Review of Scientific Instruments, 84, 103710(2013).
[130] C KEALHOFER, S M FOREMAN, S GERLICH et al. Ultrafast laser-triggered emission from hafnium carbide tips. Physical Review B, 86(2012).
[131] G HERINK, D R SOLLI, M GULDE et al. Field-driven photoemission from nanostructures quenches the quiver motion. Nature, 483, 190-193(2012).
[132] M KRüGER, M SCHENK, P HOMMELHOFF. Attosecond control of electrons emitted from a nanoscale metal tip. Nature, 475, 78-81(2011).
[133] R BORMANN, M GULDE, A WEISMANN et al. Tip-enhanced strong-field photoemission. Physical Review Letters, 105, 147601(2010).
[134] M SCHENK, M KRüGER, P HOMMELHOFF. Strong-field above-threshold photoemission from sharp metal tips. Physical Review Letters, 105, 257601(2010).
[135] H YANAGISAWA, C HAFNER, P DONá et al. Optical control of field-emission sites by femtosecond laser pulses. Physical Review Letters, 103, 257603(2009).
[136] D EHBERGER, J HAMMER, M EISELE et al. Highly coherent electron beam from a laser-triggered tungsten needle tip. Physical Review Letters, 114, 227601(2015).
[137] A FEIST, N BACH, N RUBIANO D A SILVA et al. Ultrafast transmission electron microscopy using a laser-driven field emitter： Femtosecond resolution with a high coherence electron beam. Ultramicroscopy, 176, 63-73(2017).
[138] D S YANG, O F MOHAMMED, A H ZEWAIL. Scanning ultrafast electron microscopy. Proceedings of the National Academy of Sciences of the United States of America, 107, 14993-14998(2010).
[139] B COOK, M BRONSGEEST, K HAGEN et al. Improving the energy spread and brightness of thermal-field （Schottky） emitters with PHAST-photo assisted Schottky tip. Ultramicroscopy, 109, 403-412(2009).
[140] G FURSEY. Field emission in vacuum microelectronics. Microdevices(2005).
[141] T ICHIMURA, R SHIMIZU et al. Quantitative evaluation of spatial coherence of the electron beam from low temperature field emitters. Physical Review Letters, 92, 246103(2004).
[142] K NAGAOKA, T YAMASHITA, S UCHIYAMA et al. Monochromatic electron emission from the macroscopic quantum state of a superconductor. Nature, 396, 557-559(1998).
[143] A J MCCULLOCH, D V SHELUDKO, M JUNKER et al. High-coherence picosecond electron bunches from cold atoms. Nature Communications, 4, 1692(2013).
[144] W J ENGELEN, DER HEIJDEN M AVAN, D J BAKKER et al. High-coherence electron bunches produced by femtosecond photoionization. Nature Communications, 4, 1693(2013).
[145] DER GEER S BVAN, M J DE LOOS, E J D VREDENBREGT et al. Ultracold electron source for single-shot， ultrafast electron diffraction. Microscopy and Microanalysis, 15, 282-289(2009).
[146] O J LUITEN, B J CLAESSENS, DER GEER S BVAN et al. Ultracold electron sources. International Journal of Modern Physics A, 22, 3882-3897(2007).
[147] B J CLAESSENS, DER GEER S BVAN, G TABAN et al. Ultracold electron source. Physical Review Letters, 95, 164801(2005).
[148] J. METCALFHAROLD, P V D STRATEN. Laser cooling and trapping. Graduate texts in contemporary physics(1999).
[149] W J ENGELEN, E P SMAKMAN, D J BAKKER et al. Effective temperature of an ultracold electron source based on near-threshold photoionization. Ultramicroscopy, 136, 73-80(2014).
[150] G TABAN, M P REIJNDERS, B FLESKENS et al. Ultracold electron source for single-shot diffraction studies. EPL, 91, 46004(2010).
[151] S D SALIBA, C T PUTKUNZ, D V SHELUDKO et al. Spatial coherence of electron bunches extracted from an arbitrarily shaped cold atom electron source. Optics Express, 20, 3967-3974(2012).
[152] M W V MOURIK, W J ENGELEN, E J D VREDENBREGT et al. Ultrafast electron diffraction using an ultracold source. Structural Dynamics, 1(2014).
[153] R W SPEIRS, C T PUTKUNZ, A J MCCULLOCH et al. Single-shot electron diffraction using a cold atom electron source. Journal of Physics B-Atomic Molecular and Optical Physics, 48, 214002(2015).
[154] L WIMMER, G HERINK, D R SOLLI et al. Terahertz control of nanotip photoemission. Nature Physics, 10, 432-436(2014).
[155] A FEIST, K E ECHTERNKAMP, J SCHAUSS et al. Quantum coherent optical phase modulation in an ultrafast transmission electron microscope. Nature, 521, 200-203(2015).
[156] D J FLANNIGAN, A H ZEWAIL. 4D electron microscopy： Principles and applications. Accounts of Chemical Research, 45, 1828-1839(2012).
[157] Y MORIMOTO, P BAUM. Attosecond control of electron beams at dielectric and absorbing membranes. Physical Review A, 97(2018).
[158] S A HILBERT, C UITERWAAL, B BARWICK et al. Temporal lenses for attosecond and femtosecond electron pulses. Proceedings of the National Academy of Sciences of the United States of America, 106, 10558-10563(2009).
[159] M FERRARIO, D ALESINI, A BACCI et al. Experimental demonstration of emittance compensation with velocity bunching. Physical Review Letters, 104(2010).
[160] S G ANDERSON, P MUSUMECI, J B ROSENZWEIG et al. Velocity bunching of high-brightness electron beams. Physical Review Special Topics-Accelerators and Beams, 8(2005).
[161] X H LU, C X TANG, R K LI et al. Generation and measurement of velocity bunched ultrashort bunch of pC charge. Physical Review Special Topics-Accelerators and Beams, 18(2015).
[162] A GAHLMANN, S T PARK, A H ZEWAIL. Ultrashort electron pulses for diffraction， crystallography and microscopy： theoretical and experimental resolutions. Physical Chemistry Chemical Physics, 10, 2894-2909(2008).
[163] B J SIWICK, J R DWYER, R E JORDAN et al. Ultrafast electron optics： propagation dynamics of femtosecond electron packets. Journal of Applied Physics, 92, 1643-1648(2002).
[164] C M SCOBY, R K LI, E THRELKELD et al. Single-shot 35 fs temporal resolution electron shadowgraphy. Applied Physics Letters, 102(2013).
[165] G H KASSIER, N ERASMUS, K HAUPT et al. Photo-triggered pulsed cavity compressor for bright electron bunches in ultrafast electron diffraction. Applied Physics B-Lasers and Optics, 109, 249-257(2012).
[166] G H KASSIER, K HAUPT, N ERASMUS et al. Achromatic reflectron compressor design for bright pulses in femtosecond electron diffraction. Journal of Applied Physics, 105, 113111(2009).
[167] A M MICHALIK, E Y SHERMAN, J E SIPE. Theory of ultrafast electron diffraction： the role of the electron bunch properties. Journal of Applied Physics, 104(2008).
[168] J B ROSENZWEIG. Fundamentals of beam physics(2003).
[169] O J LUITEN, DER GEER S BVAN, M J DE LOOS et al. How to realize uniform three-dimensional ellipsoidal electron bunches. Physical Review Letters, 93(2004).
[170] O ZANDI, K J WILKIN, Y XIONG et al. High current table-top setup for femtosecond gas electron diffraction. Structural Dynamics, 4(2017).
[171] M WALBRAN, A GLISERIN, K JUNG et al. 5-femtosecond laser-electron synchronization for pump-probe crystallography and diffraction. Physical Review Applied, 4(2015).
[172] S SCHULZ, I GRGURAŠ, C BEHRENS et al. Femtosecond all-optical synchronization of an X-ray free-electron laser. Nature Communications, 6, 5938(2015).
[173] G J H BRUSSAARD, A LASSISE, P L E M PASMANS et al. Direct measurement of synchronization between femtosecond laser pulses and a 3 GHz radio frequency electric field inside a resonant cavity. Applied Physics Letters, 103, 141105(2013).
[174] D ZHANG, A FALLAHI, M HEMMER et al. Segmented terahertz electron accelerator and manipulator （STEAM）. Nature Photonics, 12, 336-342(2018).
[175] E A NANNI, W R HUANG, K H HONG et al. Terahertz-driven linear electron acceleration. Nature Communications, 6, 8486(2015).
[176] D EHBERGER, A RYABOV, P BAUM. Tilted electron pulses. Physical Review Letters, 121(2018).
[177] R K LI, M C HOFFMANN, E A NANNI et al. Terahertz-based subfemtosecond metrology of relativistic electron beams. Physical Review Accelerators and Beams, 22(2019).
[178] E CURRY, S FABBRI, J MAXSON et al. Meter-scale terahertz-driven acceleration of a relativistic beam. Physical Review Letters, 120(2018).
[179] L ZHAO, Z WANG, C LU et al. Terahertz streaking of few-femtosecond relativistic electron beams. Physical Review X, 8(2018).
[180] T V OUDHEUSDEN, P L E M PASMANS, S B V D GEER et al. Compression of sub-relativistic space-charge-dominated electron bunches for single-shot femtosecond electron diffraction. Physical Review Letters, 105, 264801(2010).
[181] D EHBERGER, K J MOHLER, T VASILEIADIS et al. Terahertz compression of electron pulses at a planar mirror membrane. Physical Review Applied, 11(2019).
[182] M R OTTO, L P R D COTRET, M J STERN et al. Solving the jitter problem in microwave compressed ultrafast electron diffraction instruments： Robust sub-50 fs cavity-laser phase stabilization. Structural Dynamics, 4(2017).
[183] J BREUER, P HOMMELHOFF. Laser-based acceleration of nonrelativistic electrons at a dielectric structure. Physical Review Letters, 111, 134803(2013).
[184] Y MORIMOTO, P BAUM. Single-cycle optical control of beam electrons. Physical Review Letters, 125, 193202(2020).
[185] M KOZAK, N SCHOENENBERGER, P HOMMELHOFF. Ponderomotive generation and detection of attosecond free-electron pulse trains. Physical Review Letters, 120, 103203(2018).
[186] S BANERJEE, S SEPKE, R SHAH et al. Optical deflection and temporal characterization of an ultrafast laser-produced electron beam. Physical Review Letters, 95(2005).
[187] Y LIU, J ZHANG, H WU et al. Ponderomotive scattering of electrons and its application to measure the pulse duration of ultrafast electron beams. Journal of Applied Physics, 103(2008).
[188] C T HEBEISEN, R ERNSTORFER, M HARB et al. Femtosecond electron pulse characterization using laser ponderomotive scattering. Optics Letters, 31, 3517-3519(2006).
[189] J FABIAŃSKA, G KASSIER, T FEURER. Split ring resonator based THz-driven electron streak camera featuring femtosecond resolution. Scientific Reports, 4, 5645(2014).
[190] P BAUM, A H ZEWAIL. Breaking resolution limits in ultrafast electron diffraction and microscopy. Proceedings of the National Academy of Sciences of the United States of America, 103, 16105-16110(2006).
[191] C ZHOU, Y BAI, L SONG et al. Direct mapping of attosecond electron dynamics. Nature Photonics, 15, 216-221(2021).
[192] S T PARK, M LIN, A H ZEWAIL. Photon-induced near-field electron microscopy （PINEM）： theoretical and experimental. New Journal of Physics, 12, 123028(2010).
[193] A YURTSEVER, DER VEEN R MVAN, A H ZEWAIL. Subparticle ultrafast spectrum imaging in 4D electron microscopy. Science, 335, 59-64(2012).
[194] L PIAZZA, T T A LUMMEN, E QUINONEZ et al. Simultaneous observation of the quantization and the interference pattern of a plasmonic near-field. Nature Communications, 6, 6407(2015).
[195] X FU, F BARANTANI, S GARGIULO et al. Nanoscale-femtosecond dielectric response of mott insulators captured by two-color near-field ultrafast electron microscopy. Nature Communications, 11, 5770-5770(2020).
[196] S T PARK, A H ZEWAIL. Chirped imaging pulses in four-dimensional electron microscopy： femtosecond pulsed hole burning. New Journal of Physics, 14(2012).
[197] D A PLEMMONS, PARK STAE, A H ZEWAIL et al. Characterization of fast photoelectron packets in weak and strong laser fields in ultrafast electron microscopy. Ultramicroscopy, 146, 97-102(2014).
[198] G STORECK, J G HORSTMANN, T DIEKMANN et al. Structural dynamics of incommensurate charge-density waves tracked by ultrafast low-energy electron diffraction. Structural Dynamics, 7(2020).
[199] J G HORSTMANN, H BöCKMANN et al. Coherent control of a surface structural phase transition. Nature, 583, 232-236(2020).
[200] F QI, Z MA, L ZHAO et al. Breaking 50 femtosecond resolution barrier in MeV ultrafast electron diffraction with a double bend achromat compressor. Physical Review Letters, 124, 134803(2020).
[201] J YANG, X ZHU, NUNES J PF. et al. Simultaneous observation of nuclear and electronic dynamics by ultrafast electron diffraction. Science, 368, 885-889(2020).
[202] A KOGAR, A ZONG, P E DOLGIREV et al. Light-induced charge density wave in LaTe3. Nature Physics, 16, 159-163(2020).
[203] C M NYBY, C D PEMMARAJU et al. An ultrafast symmetry switch in a weyl semimetal. Nature, 565, 61-66(2019).
[204] http：//www.physics.mcgill.ca/siwicklab/hardware.html
[205] F CARBONE, D S YANG, E GIANNINI et al. Direct role of structural dynamics in electron-lattice coupling of superconducting cuprates. Proceedings of the National Academy of Sciences of the United States of America, 105, 20161-20166(2008).
[206] C Y RUAN, V A LOBASTOV, F VIGLIOTTI et al. Ultrafast electron crystallography of interfacial water. Science, 304, 80-84(2004).
[207] S CHEN, M T SEIDEL, A H ZEWAIL. Atomic-scale dynamical structures of fatty acid bilayers observed by ultrafast electron crystallography. Proceedings of the National Academy of Sciences of the United States of America, 102, 8854-8859(2005).
[208] L P R DE COTRET, J H POHLS, M J STERN et al. Time- and momentum-resolved phonon population dynamics with ultrafast electron diffuse scattering. Physical Review B, 100, 214115(2019).
[209] H S PARK, J S BASKIN et al. Atomic-scale imaging in real and energy space developed in ultrafast electron microscopy. Nano Letters, 7, 2545-2551(2007).
[210] H S PARK, J S BASKIN, B BARWICK et al. 4D ultrafast electron microscopy： Imaging of atomic motions， acoustic resonances， and moire fringe dynamics. Ultramicroscopy, 110, 7-19(2009).
[211] A YURTSEVER, A H ZEWAIL. 4D nanoscale diffraction observed by convergent-beam ultrafast electron microscopy. Science, 326, 708-712(2009).
[212] O H KWON, B BARWICK, H S PARK et al. 4D visualization of embryonic， structural crystallization by single-pulse microscopy. Proceedings of the National Academy of Sciences of the United States of America, 105, 8519-8524(2008).
[213] O H KWON, A H ZEWAIL. 4D electron tomography. Science, 328, 1668-1673(2010).
[214] D R CREMONS, D A PLEMMONS, D J FLANNIGAN. Defect-mediated phonon dynamics in TaS2 and WSe2. Structural Dynamics, 4(2017).
[215] Y ZHANG, D J FLANNIGAN. Observation of anisotropic strain-wave dynamics and few-layer dephasing in MoS2 with ultrafast electron microscopy. Nano Letters, 19, 8216-8224(2019).
[216] M ZHANG, G CAO, H TIAN et al. Picosecond view of a martensitic transition and nucleation in the shape memory alloy Mn50Ni40Sn10 by four-dimensional transmission electron microscopy. Physical Review B, 96, 174203(2017).
[217] A RYABOV, P BAUM. Electron microscopy of electromagnetic waveforms. Science, 353, 374-377(2016).
[218] U J LORENZ, A H ZEWAIL. Observing liquid flow in nanotubes by 4D electron microscopy. Science, 344, 1496-1500(2014).
[219] B CHEN, X FU, J TANG et al. Dynamics and control of gold-encapped gallium arsenide nanowires imaged by 4D electron microscopy. Proceedings of the National Academy of Sciences of the United States of America, 114, 12876-12881(2017).
[220] X FU, S LIU, B CHEN et al. Observation and control of unidirectional ballistic dynamics of nanoparticles at a liquid-gas interface by 4D electron microscopy. ACS Nano, 15, 6801-6810(2021).
[221] T DANZ, T DOMRÖSE, C ROPERS. Ultrafast nanoimaging of the order parameter in a structural phase transition. Science, 371, 371-374(2021).
[222] T T A LUMMEN, R J LAMB, G BERRUTO et al. Imaging and controlling plasmonic interference fields at buried interfaces. Nature Communications, 7, 13156(2016).
[223] K WANG, R DAHAN, M SHENTCIS et al. Coherent interaction between free electrons and a photonic cavity. Nature, 582, 50-54(2020).
[224] O KFIR, H LOURENÇO-MARTINS, G STORECK et al. Controlling free electrons with optical whispering-gallery modes. Nature, 582, 46-49(2020).
[225] G M VANACORE, G BERRUTO, I MADAN et al. Ultrafast generation and control of an electron vortex beam via chiral plasmonic near fields. Nature Materials, 18, 573-579(2019).
[226] N RDA SILVA, M MOELLER, A FEIST et al. Nanoscale mapping of ultrafast magnetization dynamics with femtosecond lorentz microscopy. Physical Review X, 8(2018).
[227] X FU, S D POLLARD, B CHEN et al. Optical manipulation of magnetic vortices visualized in situ by lorentz electron microscopy. Science Advances, 4(2018).
[228] G CAO, S JIANG, J AKERMAN et al. Femtosecond laser driven precessing magnetic gratings. Nanoscale, 13, 3746-3756(2021).
[229] A W P FITZPATRICK, U J LORENZ, G M VANACORE et al. 4D cryo-electron microscopy of proteins. Journal of the American Chemical Society, 135, 19123-19126(2013).
[230] U J LORENZ, A H ZEWAIL. Biomechanics of DNA structures visualized by 4D electron microscopy. Proceedings of the National Academy of Sciences of the United States of America, 110, 2822-2827(2013).
[231] X FU, B CHEN, J TANG et al. Imaging rotational dynamics of nanoparticles in liquid by 4D electron microscopy. Science, 355, 494-498(2017).
[232] X FU, B CHEN, J TANG et al. Photoinduced nanobubble-driven superfast diffusion of nanoparticles imaged by 4D electron microscopy. Science Advances, 3(2017).
[233] X FU, B CHEN, C LI et al. Direct visualization of photomorphic reaction dynamics of plasmonic nanoparticles in liquid by four-dimensional electron microscopy. Journal of Physical Chemistry Letters, 9, 4045-4052(2018).
[234] C JING, Y ZHU, A LIU et al. Tunable electron beam pulser for picoseconds stroboscopic microscopy in transmission electron microscopes. Ultramicroscopy, 207, 112829(2019).
[235] K B SCHLIEP, M B KATZ et al. Laser-free GHz stroboscopic transmission electron microscope： Components， system integration， and practical considerations for pump-probe measurements. Review of Scientific Instruments, 91(2020).
[236] X FU, E WANG, Y ZHAO et al. Direct visualization of electromagnetic wave dynamics by laser-free ultrafast electron microscopy. Science Advances, 6(2020).
[237] A LASSISE, P H A MUTSAERS, O J LUITEN. Compact， low power radio frequency cavity for femtosecond electron microscopy. Review of Scientific Instruments, 83(2012).
[238] W VERHOEVEN, RENS J F MVAN, E R KIEFT et al. High quality ultrafast transmission electron microscopy using resonant microwave cavities. Ultramicroscopy, 188, 85-89(2018).
[239] O F MOHAMMED, D S YANG et al. 4D scanning ultrafast electron microscopy： visualization of materials surface dynamics. Journal of the American Chemical Society, 133, 7708-7711(2011).
[240] B LIAO, E NAJAFI. Scanning ultrafast electron microscopy： A novel technique to probe photocarrier dynamics with high spatial and temporal resolutions. Materials Today Physics, 2, 46-53(2017).
[241] E NAJAFI, T D SCARBOROUGH, J TANG et al. Four-dimensional imaging of carrier interface dynamics in p-n junctions. Science, 347, 164-167(2015).
[242] B LIAO, H ZHAO, E NAJAFI et al. Spatial-temporal imaging of anisotropic photocarrier dynamics in black phosphorus. Nano Letters, 17, 3675-3680(2017).
[243] M ZANI, V SALA, G IRDE et al. Charge dynamics in aluminum oxide thin film studied by ultrafast scanning electron microscopy. Ultramicroscopy, 187, 93-97(2018).
[244] J SUN, V A MELNIKOV, J I KHAN et al. Real-space imaging of carrier dynamics of materials surfaces by second-generation four-dimensional scanning ultrafast electron microscopy. Journal of Physical Chemistry Letters, 6, 3884-3890(2015).
[245] A M EL-ZOHRY, B S SHAHEEN, V M BURLAKOV et al. Extraordinary carrier diffusion on CdTe surfaces uncovered by 4D electron microscopy. Chem, 5, 706-718(2019).
[246] R BOSE, A ADHIKARI, V M BURLAKOV et al. Imaging localized energy states in silicon-doped InGaN nanowires using 4D electron microscopy. ACS Energy Letters, 3, 476-481(2018).
[247] A STECKENBORN, H MUNZEL, D BIMBERG. Cathodoluminescence lifetime pattern of GaAs-surfaces around dislocations. Journal of Luminescence, 24, 351-354(1981).
[248] M HASTENRATH, E KUBALEK. Time-resolved cathodoluminescence in scanning electron-microscopy. Scanning Electron Microscopy, 1, 157-173(1982).
[249] S MYHAJLENKO, W K KE. Time-resolved cathodoluminescence by delayed coincidence. Journal of Physics E-Scientific Instruments, 17, 200-203(1984).
[250] M MERANO, S SONDEREGGER, A CROTTINI et al. Probing carrier dynamics in nanostructures by picosecond cathodoluminescence. Nature, 438, 479-482(2005).
[251] K FURUSAWA, Y ISHIKAWA, M TASHIRO et al. Local carrier dynamics around the sub-surface basal-plane stacking faults of GaN studied by spatio-time-resolved cathodoluminescence using a front-excitation-type photoelectron-gun. Applied Physics Letters, 103(2013).
[252] M SHAHMOHAMMADI, G JACOPIN, X FU et al. Exciton hopping probed by picosecond time-resolved cathodoluminescence. Applied Physics Letters, 107, 141101(2015).
[253] X FU, G JACOPIN, M SHAHMOHAMMADI et al. Exciton drift in semiconductors under uniform strain gradients： Application to bent ZnO microwires. ACS Nano, 8, 3412-3420(2014).
