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低于阈值激光功率密度下Mg原子的非序列双电离

Nonsequential Double Ionization of Mg Atoms Below Threshold Laser Power Density

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摘要

基于经典系综模型,研究了Mg原子在低于重碰撞阈值激光功率密度下的非序列双电离(NSDI)。当少周期量级线性偏振激光的功率密度为3.0×1013 W·cm-2时,末态关联电子动量分布中的电子对主要分布在第一、第二和第四象限,第一象限中的电子对呈现了明显的关联行为。分析了重碰撞和双电离之间的延迟时间,发现不同的延迟时间对应着不同的电离过程,延迟时间对电子出射过程具有显著影响;延迟时间小于半个周期的NSDI事件,双电子倾向于反方向出射,而延迟时间大于半个周期的,存在双电子同方向出射的可能。

Abstract

The nonsequential double ionization (NSDI) of Mg atoms below the recollision threshold laser power density is investigated based on the classical ensemble model. For a few-cycle linearly polarized laser pulses with a power density of 3.0×1013 W·cm-2, the electron pairs in the correlated-electron momentum distribution at a final state mainly locate in the first, second and fourth quadrants. Moreover, the electron pairs in the first quadrant show an obvious correlation behavior. By analyzing the delay time between the recollision and the double ionization, it is found that the different delay time corresponds to different ionization processes and the delay time plays an important role in the process of the electron emission. For the NSDI events with delay time less than a half cycle, two electrons tend to emit with an opposite direction, however, for those with delay time larger than a half cycle, there exist emission electrons with the same direction.

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中图分类号:O562.4;O562.5

DOI:10.3788/aos201838.0702003

所属栏目:原子与分子物理

基金项目:国家自然科学基金(61275103)、上海市自然科学基金(18ZR1413600)

收稿日期:2018-01-31

修改稿日期:2018-03-08

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作者单位    点击查看

冯凤珍:上海大学理学院, 上海 200444
白丽华:上海大学理学院, 上海 200444
郑晓晓:上海大学理学院, 上海 200444

联系人作者:白丽华(lhbai@163.com)

备注:冯凤珍(1993-),女,硕士研究生,主要从事非序列双电离方面的研究。E-mail: ffz201@163.com

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引用该论文

Feng Fengzhen,Bai Lihua,Zheng Xiaoxiao. Nonsequential Double Ionization of Mg Atoms Below Threshold Laser Power Density[J]. Acta Optica Sinica, 2018, 38(7): 0702003

冯凤珍,白丽华,郑晓晓. 低于阈值激光功率密度下Mg原子的非序列双电离[J]. 光学学报, 2018, 38(7): 0702003

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