Photoemission mechanisms of methane in intense laser fields

Huailiang Xu; Ruxin Li; See Leang Chin

doi:10.3788/COL201513.070007

Journals >Chinese Optics Letters >Volume 13 >Issue 7 >Page 070007 > Article

Chinese Optics Letters
Vol. 13, Issue 7, 070007 (2015)

Photoemission mechanisms of methane in intense laser fields

Huailiang Xu^1、2、*, Ruxin Li^2、**, and See Leang Chin^2、3、***

Author Affiliations

¹State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun 130012, China

²State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China

³Centre d’Optique, Photonique et Laser et le Département de Physique, Université Laval, Quebec City, Quebec G1V0A6, Canada

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DOI: 10.3788/COL201513.070007 Cite this Article Set citation alerts

Huailiang Xu, Ruxin Li, See Leang Chin. Photoemission mechanisms of methane in intense laser fields[J]. Chinese Optics Letters, 2015, 13(7): 070007 Copy Citation Text

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Abstract

The visible and near-UV emission spectroscopy of methane (

{CH}_{4}

) induced by a femtosecond intense laser field (800 nm, 40 fs,

10^{14} W / {cm}^{2}

) is studied. By measuring the decay profiles of the neutral fragment product CH (

A^{2} Δ \to X^{2} Π

), two reaction pathways, i.e., the electron-ion recombination through

e^{} + {CH}_{4}^{+}

and the direct disintegration of

{CH}_{4}^{+}

are found to be responsible for populating the electronic excited states of the neutral fragment product CH, which gives rise to the photoemissions. Our results provide complementary information on previous understanding of the strong-field-induced photoemission mechanism of