Photoemission mechanisms of methane in intense laser fields  

作　　者：徐淮良 李儒新 陈瑞良 

机构地区：[1]State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering,Jilin University [2]State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics,Chinese Academy of Sciences [3]Centre d’Optique, Photonique et Laser et le Département de Physique, Université Laval

出　　处：《Chinese Optics Letters》2015年第7期23-26,共4页中国光学快报（英文版）

基　　金：partially supported by the National Natural Science Foundation of China (61427816 and 61235003);the National Basic Research Program of China (2014CB921300);the Research Fund for the Doctoral Program of Higher Education of China;the Open Fund of the State Key Laboratory of High Field Laser Physics (SIOM),Canada Research Chairs, NSERC, Femtotech and FQRNT

摘　　要：The visible and near-UV emission spectroscopy of methane （CH4） induced by a femtosecond intense laser field （800 nm, 40 fs, 1014 W/cm2） is studied. By measuring the decay profiles of the neutral fragment product CH （A2△→X2П）, two reaction pathways, i.e., the electron-ion recombination through e- ＋ CH＋ and the direct disintegration of CH＋ 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 CH4 through neutral dissociation of superexcited states.The visible and near-UV emission spectroscopy of methane （CH4） induced by a femtosecond intense laser field （800 nm, 40 fs, 1014 W/cm2） is studied. By measuring the decay profiles of the neutral fragment product CH （A2△→X2П）, two reaction pathways, i.e., the electron-ion recombination through e- ＋ CH＋ and the direct disintegration of CH＋ 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 CH4 through neutral dissociation of superexcited states.

关 键 词：Electric excitation Emission spectroscopy Laser optics METHANE 

分 类 号：O437[机械工程—光学工程] TN383.1[理学—光学]