摘要
The above-threshold ionization process of ammonia molecules induced by a femtosecond laser field at 800 nm is studied in the intensity range from 1.6×10^(13) to 5.7×10^(13)W/cm^(2).Channel switching under different laser intensities is observed and identified in the photoelectron kinetic energy spectra of ammonia.Based on the photoelectron kinetic energy distributions and the photoelectron angular distributions,the characteristic peaks observed are exclusively assigned to the multiphoton resonance through certain intermediate states,followed by multiphoton above-threshold ionization.
作者
Qin Yang
Jing Leng
Yan-Hui Wang
Ya-Nan Sun
Hai-Bin Du
Dong-Dong Zhang
Le-Le Song
Lan-Hai He
Fu-Chun Liu
杨钦;冷静;王艳辉;孙亚楠;杜海滨;张栋栋;宋乐乐;赫兰海;刘福春(Institute of Atomic and Molecular Physics,Jilin University,Changchun 130012,China;College of Electronic Science and Engineering,State Key Laboratory on Integrated Optoelectronics,Jilin University,Changchun 130012,China;Department of Physics,No.151 Middle School of Changchun,Changchun 130000,China;Jilin Provincial Key Laboratory of Applied Atomic and Molecular Spectroscopy,Jilin University,Changchun 130012,China;Department of Comprehensive,Harbin City Vocational College,Harbin 150000,China;Jilin Institute of Chemical Technology,Jilin 132022,China)
基金
supported by the National Natural Science Foundation of China(Grant Nos.11574116,11534004,11704147,and 10704028)。
