中国物理B ›› 2013, Vol. 22 ›› Issue (8): 84203-084203.doi: 10.1088/1674-1056/22/8/084203

• ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS • 上一篇    下一篇

Simple formula for the ionization rate of diatomic molecules in an intense laser field using the velocity gauge

唐增华, 李永庆, 马凤才   

  1. Department of Physics, Liaoning University, Shenyang 110036, China
  • 收稿日期:2012-11-12 修回日期:2012-12-21 出版日期:2013-06-27 发布日期:2013-06-27
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No. 11274149) and the Natural Science Foundation of Liaoning Province, China (Grant No. 20121032).

Simple formula for the ionization rate of diatomic molecules in an intense laser field using the velocity gauge

Tang Zeng-Hua (唐增华), Li Yong-Qing (李永庆), Ma Feng-Cai (马凤才)   

  1. Department of Physics, Liaoning University, Shenyang 110036, China
  • Received:2012-11-12 Revised:2012-12-21 Online:2013-06-27 Published:2013-06-27
  • Contact: Li Yong-Qing, Ma Feng-Cai E-mail:yqli@lnu.edu.cn; fcma@lnu.edu.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No. 11274149) and the Natural Science Foundation of Liaoning Province, China (Grant No. 20121032).

摘要: We derive a general ionization rate formula for the system of diatomic molecules in the velocity gauge. A more concise expression of the photoionization rate in the tunnel region is obtained for the first time. Comparisons are made among the different versions of strong-field approximation. The numerical study shows that the ionization rate in the velocity gauge is underestimated by a few orders compared with that in the length gauge. Our simple formula of ionization rate may provide an insight into the ionization mechanism for the system of diatomic molecules.

关键词: strong-field approximation, gauge invariance, tunnel ionization

Abstract: We derive a general ionization rate formula for the system of diatomic molecules in the velocity gauge. A more concise expression of the photoionization rate in the tunnel region is obtained for the first time. Comparisons are made among the different versions of strong-field approximation. The numerical study shows that the ionization rate in the velocity gauge is underestimated by a few orders compared with that in the length gauge. Our simple formula of ionization rate may provide an insight into the ionization mechanism for the system of diatomic molecules.

Key words: strong-field approximation, gauge invariance, tunnel ionization

中图分类号:  (Strong-field excitation of optical transitions in quantum systems; multiphoton processes; dynamic Stark shift)

  • 42.50.Hz
33.80.Eh (Autoionization, photoionization, and photodetachment)