中国物理B ›› 2018, Vol. 27 ›› Issue (4): 43201-043201.doi: 10.1088/1674-1056/27/4/043201

• ATOMIC AND MOLECULAR PHYSICS • 上一篇    下一篇

Dynamic stabilization of Na atom in an intense pulsed laser field

Xiao-Li Guo(郭晓丽), Song-Feng Zhao(赵松峰), Guo-Li Wang(王国利), Xiao-Xin Zhou(周效信)   

  1. Key Laboratory of Atomic and Molecular Physics & Functional Materials of Gansu Province, College of Physics and Electronic Engineering, Northwest Normal University, Lanzhou 730070, China
  • 收稿日期:2017-12-11 修回日期:2018-01-03 出版日期:2018-04-05 发布日期:2018-04-05
  • 通讯作者: Song-Feng Zhao, Xiao-Xin Zhou E-mail:zhaosf@nwnu.edu.cn;zhouxx@nwnu.edu.cn
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 11465016, 11664035, and 11764038).

Dynamic stabilization of Na atom in an intense pulsed laser field

Xiao-Li Guo(郭晓丽), Song-Feng Zhao(赵松峰), Guo-Li Wang(王国利), Xiao-Xin Zhou(周效信)   

  1. Key Laboratory of Atomic and Molecular Physics & Functional Materials of Gansu Province, College of Physics and Electronic Engineering, Northwest Normal University, Lanzhou 730070, China
  • Received:2017-12-11 Revised:2018-01-03 Online:2018-04-05 Published:2018-04-05
  • Contact: Song-Feng Zhao, Xiao-Xin Zhou E-mail:zhaosf@nwnu.edu.cn;zhouxx@nwnu.edu.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 11465016, 11664035, and 11764038).

摘要: We investigate theoretically the ionization properties of the valence electron for the alkali metal atom Na in an intense pulsed laser field by solving numerically the time-dependent Schrödinger equation with an accurate l-dependent model potential. By calculating the variations of the ionization probabilities with laser peak intensity for wavelengths ranging from 200 nm to 600 nm, our results present a dynamic stabilization trend for the Na atom initially in its ground state (3s) and the excited states (3p and 4s) exposed to an intense pulsed laser field. Especially a clear “window” of dynamic stabilization at lower laser intensities and longer wavelengths for the initial state 4s (the second excited state) is found. By analyzing the time-dependent population distributions of the valence electron in the bound states with the different values of principal quantum number n and orbital quantum number l, we can attribute the dynamic stabilization to the periodic population in the low-excited states since the valence electron oscillates rapidly between the lowly excited states and the continuum states.

关键词: accurate model potential, atomic dynamic stabilization, ionization probability

Abstract: We investigate theoretically the ionization properties of the valence electron for the alkali metal atom Na in an intense pulsed laser field by solving numerically the time-dependent Schrödinger equation with an accurate l-dependent model potential. By calculating the variations of the ionization probabilities with laser peak intensity for wavelengths ranging from 200 nm to 600 nm, our results present a dynamic stabilization trend for the Na atom initially in its ground state (3s) and the excited states (3p and 4s) exposed to an intense pulsed laser field. Especially a clear “window” of dynamic stabilization at lower laser intensities and longer wavelengths for the initial state 4s (the second excited state) is found. By analyzing the time-dependent population distributions of the valence electron in the bound states with the different values of principal quantum number n and orbital quantum number l, we can attribute the dynamic stabilization to the periodic population in the low-excited states since the valence electron oscillates rapidly between the lowly excited states and the continuum states.

Key words: accurate model potential, atomic dynamic stabilization, ionization probability

中图分类号:  (Multiphoton ionization and excitation to highly excited states)

  • 32.80.Rm
42.50.Hz (Strong-field excitation of optical transitions in quantum systems; multiphoton processes; dynamic Stark shift)