中国物理B ›› 2005, Vol. 14 ›› Issue (6): 1114-1119.doi: 10.1088/1009-1963/14/6/010

• ATOMIC AND MOLECULAR PHYSICS • 上一篇    下一篇

Asymmetry of the photoionization rate of H atoms by a sequence of one-cycle laser pulses

白丽华, 张敬涛, 徐至展   

  1. Laboratory for High Intensity Optics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
  • 收稿日期:2004-09-08 修回日期:2005-01-25 出版日期:2005-05-27 发布日期:2005-05-27
  • 基金资助:
    Project supported by National Key Basic Research Special Foundation of China (Grant No G1999075200 ) and the National Natural Science Foundation of China (Grant No 60408008).

Asymmetry of the photoionization rate of H atoms by a sequence of one-cycle laser pulses

Bai Li-Hua (白丽华), Zhang Jing-Tao (张敬涛), Xu Zhi-Zhan (徐至展)   

  1. Laboratory for High Intensity Optics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
  • Received:2004-09-08 Revised:2005-01-25 Online:2005-05-27 Published:2005-05-27
  • Supported by:
    Project supported by National Key Basic Research Special Foundation of China (Grant No G1999075200 ) and the National Natural Science Foundation of China (Grant No 60408008).

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摘要： Using an unperturbated scattering theory, the characteristics of H atom photoionization are studied respectively by a linearly and by a circularly polarized one-cycle laser pulse sequence. The asymmetries for photoelectrons in two directions opposite to each other are investigated. It is found that the asymmetry degree varies with the carrier-envelope (CE) phase, laser intensity, as well as the kinetic energy of photoelectrons. For the linear polarization, the maximal ionization rate varies with the CE phase, and the asymmetry degree varies with the CE phase in a sine-like pattern. For the circular polarizaion, the maximal ionization rate keeps constant for various CE phases, but the variation of asymmetry degree is still in a sine-like variation pattern.

Abstract: Using an unperturbated scattering theory, the characteristics of H atom photoionization are studied respectively by a linearly and by a circularly polarized one-cycle laser pulse sequence. The asymmetries for photoelectrons in two directions opposite to each other are investigated. It is found that the asymmetry degree varies with the carrier-envelope (CE) phase, laser intensity, as well as the kinetic energy of photoelectrons. For the linear polarization, the maximal ionization rate varies with the CE phase, and the asymmetry degree varies with the CE phase in a sine-like pattern. For the circular polarizaion, the maximal ionization rate keeps constant for various CE phases, but the variation of asymmetry degree is still in a sine-like variation pattern.

Key words: photoionization rate, ultrashort laser pulse, asymmetry

中图分类号:  (Photoionization of atoms and ions)

  • 32.80.Fb