[1] Tjoelker R L, Prestage J, Burt E, et al. Mercury Ion Clock for a NASA Technology Demonstration Mission[J]. IEEE Transactions on Ultrasonics Ferroelectrics & Frequency Control, 2016, 63(7): 1034-1043.
[2] Yang Z H, Liu H, He Y H, et al. Optimal Microwave Radiation Field Parameters for Mercury Ion Microwave Frequency Standards[J].Chinese Physics Letters, 2016, 33(6):21-24.
[3] She L, Wang W M, Bai L, et al. Fluorescence Detection and Buffer Gas Cooling of Trapped Mercury Ions in Paul Trap[J]. Chinese Physics Letters. 2008, 25(5):1653-1656.
[4] Burt E A, Tjoelker R L. Sub-10-16 Frequency Stability in Multi-Pole Linear Ion Trap Standards: Reduction of Number-Dependent Sensitivity[J]. Interplanetary Network Progress Report, 2006, 166.
[6] Jau Y Y, Partner H, Schwindt P D D, et al. Low-power, miniature 171Yb ion clock using an ultra-small vacuum package[J].Applied Physics Letters, 2012, 101(25):128-1324.
[7] Tjoelker R L, Prestage J D, Dick G J, et al. Long term stability of Hg+, trapped ion frequency standards[C].Frequency Control Symposium, 1993., Proceedings of the 1993 IEEE International. IEEE, 1993:132-138.
[8] Tjoelker R L, Prestage J D, Maleki, L. The JPL HG+ Extended Linear Ion Trap Frequency Standard: Status, Stability, and Accuracy Prospects[J]. 1996.
[9] Melbourne R K, Prestage J D, Maleki L. Analytic potential in a linear radio-frequency quadrupole trap with cylindrical electrodes[J].Journal of Applied Physics,1991, 69(5): 2768-2775 (in Chinese).
[11] He Y H, She L, Chen Y H, et al. Experimental determination (mHz) of the ground-state hyperfine separation of trapped 199Hg+ in a hyperbolic Paul trap[J].Chinese Physics Letters, 2012, 29(12):123201.
[12] Yang Z H, Chen Y H, Yan B B, et al. Ion-number-density-dependent effects on hyperfine transition of trapped 199Hg+, ions in quadrupole linear ion traps[J].Physics Letters A, 2017, 381(13):1145-1149.
[13] Konenkov N V, Cousins L M, Baranov V I, et al. Quadrupole mass filter operation with auxiliary quadrupolar excitation: theory and experiment[J]. International Journal of Mass Spectrometry, 2001, 208(1):17-27.
[14] Prestage J D, Janik G R, Dick G J, et al. Linear ion trap for second-order Doppler shift reduction in frequency standard application[J]. IEEE Transactions on Ultrasonics Ferroelectrics & Frequency Control, 1990, 37(6):535.
[16] Liu H, Yang Y N, He Y H, et al. Microwave-Optical Double-Resonance Spectroscopy Experiment of 199Hg+ Ground State Hyperfine Splitting in a Linear Ion Trap[J]. Chinese Physics Letters.2014, 31(6):82-85.
[17] Burt E A, Diener W A, Tjoelker R L. A compensated multi-pole linear ion trap mercury frequency standard for ultra-stable timekeeping[J]. IEEE Transactions on Ultrasonics Ferroelectrics & Frequency Control, 2008, 55(12):2586-95.
[18] Fisk P T H. Trapped-ion and trapped-atom microwave frequency standards[J].Reports on Progress in Physics, 1999, 60(8):761.
[19] Burt E A, Taghavilarigani S, Tjoelker R L. First high-resolution spectroscopy of 201Hg+ hyperfine structure: a sensitive probe of nuclear structure and the hyperfine anomaly[J].Physical Review A, 2009, 79(6):329-333.
[20] Prestage J D, Tjoelker R L, Maleki L. Mercury-ion clock based on linear multi-pole ion trap[C]. Frequency Control Symposium and Exhibition, 2000. Proceedings of the 2000 IEEE/EIA International. IEEE, 2000:706-710.
[22] Jensen J. An improved square-wave oscillator circuit[J]. Ire Transactions on Circuit Theory, 2003, 4(3):276-279.