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Exploration of the nonsequential double ionization processes of a Mg atom with different delay time in few-cycle circularly polarized laser fields

Exploration of the nonsequential double ionization processes...

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第六届全国计算原子与分子物理学术会议

作者： Tong–Tong Xu Kai-Li Song Pei-Ying Guo Shuai Ben Jun Zhang Jing Guo Xue-Shen Liu Institute of Atomic and Molecular Physics Jilin University

Most of earlier nonsequential double ionization investigations have been implemented both theoretically and experimentally [1,2]. However, multiple recollisions in NSDI process could make it difficult to understand the detailed recollision dynamics clearly. In this paper, we investigate the nonsequential double ionization（NSDI） processes of Mg in few-cycle circularly polarized laser fields by using three-dimensional classical ensemble method [3]. By using fewcycle laser pulses, we can achieve a single recollision event in NSDI process, which may help us understand the electron correlation more clearly. We will discuss the delay-time at about 0.5 o.c. for clarity and without loss of generality. For t D ＜ 0.5 o.c., most of electron momentum is mainly distributed in the first and third quadrants, which shows the correlation between two electrons is predominant. While for t D ＞ 0.5 o.c., the electron momentum is mainly distributed in the second and fourth quadrants, indicating that the anticorrelation between two electrons is predominant. In addition, we also investigate the angular distribution between the double-ionized electrons at the end of laser pulse with different delay-time. The results show that the double-ionized electrons are more likely to be ejected into opposite directions for t D ＞ 0.5 o.c. during the NSDI processes in CP laser fields.

关键词： circularly polarized laser nonsequential double ionization delay-time correlation

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Spatial distribution on high-order-harmonic generation of an H2+ molecule in intense laser fields

Spatial distribution on high-order-harmonic generation of an...

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第六届全国计算原子与分子物理学术会议

作者： Jun Zhang Hong-Dan Zhang Xue-Fei Pan Tong-Tong Xu Jing Guo Xue-Shen Liu Institute of Atomic and Molecular Physics Jilin University

＜正＞High-order-harmonic generation（HHG）via laser-matter interaction has been intensively studied in recent years because of its applications in generating isolated attosecond *** attosecond pulses are significant for probing,for example,nuclear dynamics and photoelectron wave *** the molecular structure is more complex and the degrees of freedom in molecules are more than that in atoms,the harmonic

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