红外和极紫外双色激光场中氦原子的非序列双电离动量谱研究  

Study of Momentum Spectrum of the Nonsequential Double Ionization Process of Helium Exposed to the Infrared and Extreme Ultraviolet Two-color Laser Fields

作　　者：金发成 张桐 JIN Fa-cheng;ZHANG Tong(School of Science,Xi'an Aeronautical University,Xi'an 710077,China)

机构地区：[1]西安航空学院理学院,西安710077

出　　处：《西安航空学院学报》2020年第1期82-86,共5页Journal of Xi’an Aeronautical Institute

基　　金：国家自然科学基金(11947080);大学生创新创业训练计划项目(DCX2019043)。

摘　　要：近年来,多电子体系在强激光场中的电子关联效应成为原子分子物理研究的热点,引起了人们的广泛关注。基于频域理论,研究了氦原子在红外和极紫外双色激光场中由碰撞-激发-电离机制引起的非序列双电离过程。非序列双电离动量谱呈现出复杂的干涉图样,其中干涉图样的低能部分主要来自一个通道的贡献,高能部分来自多个通道贡献的干涉。对碰撞-激发过程的研究表明,该过程需要的能量主要来自于碰撞电子之间传递的能量和电子吸收XUV光子。该研究可为多电子原子电离过程的实验研究提供科学的理论依据。In recent years,the effect of electron correlation for multi-electron systems in intense laser fields has become one of the hotspots in atomic and molecular physic study,and has attracted much attention.Based on the frequency-domain theory,the nonsequential double ionization of helium atoms induced by collision-excitation-ionization mechanism in the infrared and extreme ultraviolet two-color laser fields is investigated.The momentum spectrum of nonsequential double ionization shows complex interference patterns,where the low energy part of interference pattern mainly comes from the contribution of one channel,while the high energy part mainly comes from the contributions of three channels.The analysis of the collision-excitation process shows that the energy required for this process mainly comes from the energy transfer between the collision electrons and absorbing XUV photons.This study can provide a scientific theoretical basis for the experimental study of the ionization process of multi-electron atoms.

关 键 词：非序列双电离 频域理论 双色激光场 氦原子 碰撞-激发电离 

分 类 号：O641.1[理学—物理化学]