强飞秒激光场中氩二聚体离解多重电离的场强依赖性

IF 6.4 1区 物理与天体物理 Q1 PHYSICS, MULTIDISCIPLINARY
Pan Song, Yalei Zhu, Xiaowei Wang, Congsen Meng, Tao Jiang, Zhihui Lv, Dongwen Zhang, Chaochao Qin, Zengxiu Zhao, Jianmin Yuan
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引用次数: 0

摘要

在强度为 260 至 1020 TW/cm2 的飞秒激光场中研究了 Ar 二聚体的离解电离。利用冷靶反冲离子动量光谱仪测量了从 Ar22+→Ar++Ar+、Ar23+→Ar2++Ar+ 和 Ar24+→Ar2++Ar2+通道产生的碎片离子的三维动量和动能释放。结果表明,激光强度会显著调节离解双电离产生的碎片离子的动能和角分布。在较低的激光强度下,单位双电离后激光诱导的电荷转移对离解双电离的贡献相对较大。基于 WKB 近似的一维模型的计算结果表明,由于核心极化效应,电荷转移在激光强度较高时受到抑制。此外,氩二聚体的双重、三重和四重离解电离伴随着受挫隧道电离,这种电离随激光强度的增加而增加。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Field intensity dependence of the dissociative multiple ionization of argon dimers in strong femtosecond laser fields

The dissociative ionization of Ar dimers is investigated in femtosecond laser fields with intensities from 260 to 1020 TW/cm2. The three-dimensional momentum and kinetic-energy release of fragmental ions generated from the channels Ar22+→Ar++Ar+, Ar23+→Ar2++Ar+, and Ar24+→Ar2++Ar2+ were measured with a cold-target recoil-ion momentum spectrometer. It is shown that the laser intensity significantly modulates the kinetic energies and angular distributions of fragmental ions from dissociative double ionization. Laser-induced charge-transfer following one-site double ionization contributes relatively more to the dissociative double ionization at lower laser intensity. The calculation results of a one-dimensional model based on the WKB approximation suggest that the charge transfer is suppressed at higher laser intensity due to the core polarization effect. In addition, double, triple, and quadruple dissociative ionizations of Ar dimers are accompanied by frustrated-tunneling ionization that increases with the laser intensity.

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来源期刊
Science China Physics, Mechanics & Astronomy
Science China Physics, Mechanics & Astronomy PHYSICS, MULTIDISCIPLINARY-
CiteScore
10.30
自引率
6.20%
发文量
4047
审稿时长
3 months
期刊介绍: Science China Physics, Mechanics & Astronomy, an academic journal cosponsored by the Chinese Academy of Sciences and the National Natural Science Foundation of China, and published by Science China Press, is committed to publishing high-quality, original results in both basic and applied research. Science China Physics, Mechanics & Astronomy, is published in both print and electronic forms. It is indexed by Science Citation Index. Categories of articles: Reviews summarize representative results and achievements in a particular topic or an area, comment on the current state of research, and advise on the research directions. The author’s own opinion and related discussion is requested. Research papers report on important original results in all areas of physics, mechanics and astronomy. Brief reports present short reports in a timely manner of the latest important results.
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