Influence of multi-photon excitation on the atomic above-threshold ionization

doi:10.1088/1674-1056/24/4/043202

Abstract

Using the time-dependent pseudo-spectral scheme, we solve the time-dependent Schrödinger equation of a hydrogen-like atom in a strong laser field in momentum space. The intensity-resolved photoelectron energy spectrum in above-threshold ionization is obtained and further analyzed. We find that with the increase of the laser intensity, the above-threshold ionization emission spectrum exhibits periodic resonance structure. By analyzing the population of atomic bound states, we find that it is the multi-photon excitation of bound state that leads to the occurrence of this phenomenon, which is in fairly good agreement with the experimental results.

Keywords: time-dependent pseudo-spectral scheme above-threshold ionization resonance structure

Received: 17 October 2014
Revised: 13 November 2014
Accepted manuscript online:

PACS:	32.80.Rm	(Multiphoton ionization and excitation to highly excited states)
	42.50.Hz	(Strong-field excitation of optical transitions in quantum systems; multiphoton processes; dynamic Stark shift)

Fund:

Project supported by the National Basic Research Program of China (Grant No. 2013CB922200), the National Natural Science Foundation of China (Grants Nos. 11274141, 11034003, 11304116, 11274001, and 11247024), and the Jilin Provincial Research Foundation for Basic Research, China (Grant No. 20140101168JC).

Corresponding Authors: Yang Yu-Jun
E-mail: yangyj@jlu.edu.cn

Cite this article:

Tian Yuan-Ye (田原野), Wang Chun-Cheng (王春成), Li Su-Yu (李苏宇), Guo Fu-Ming (郭福明), Ding Da-Jun (丁大军), Roeterdink Wim-G, Chen Ji-Gen (陈基根), Zeng Si-Liang (曾思良), Liu Xue-Shen (刘学深), Yang Yu-Jun (杨玉军) Influence of multi-photon excitation on the atomic above-threshold ionization 2015 Chin. Phys. B 24 043202

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