阿秒角条纹中的库仑聚焦

IF 20.6 Q1 OPTICS
Xiaokai Li, Xiwang Liu, Chuncheng Wang, Shuai Ben, Shengpeng Zhou, Yizhang Yang, Xiaohong Song, Jing Chen, Weifeng Yang, Dajun Ding
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引用次数: 0

摘要

角度条纹技术利用近圆偏振激光脉冲,在光电子动量分布中建立最大电离瞬间与最可能发射角之间的映射关系,从而实现对原子和分子中激光诱导电子动力学的阿秒级时间分辨率探测。在这里,通过联合实验观测和改进的库仑校正强场近似统计模拟,我们发现在不同初始电离时间发射的电子趋近于最可能的发射角,这是由于非绝热激光诱导的电子隧道触发了之前未曾预料到的库仑聚焦。我们揭示了库仑聚焦在非绝热隧穿的角度条纹测量中诱发了所观察到的非直观的能量依赖趋势,并且在经典禁止势垒下的隧穿动力学会在所产生的信号上留下指纹。我们的发现对于解码具有阿秒角条纹的复杂隧道动力学具有重要意义。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Coulomb focusing in attosecond angular streaking

Coulomb focusing in attosecond angular streaking

Angular streaking technique employs a close-to-circularly polarized laser pulse to build a mapping between the instant of maximum ionization and the most probable emission angle in the photoelectron momentum distribution, thereby enabling the probe of laser-induced electron dynamics in atoms and molecules with attosecond temporal resolution. Here, through the jointed experimental observations and improved Coulomb-corrected strong-field approximation statistical simulations, we identify that electrons emitted at different initial ionization times converge to the most probable emission angle due to the previously-unexpected Coulomb focusing triggered by the nonadiabatic laser-induced electron tunneling. We reveal that the Coulomb focusing induces the observed nonintuitive energy-dependent trend in the angular streaking measurements on the nonadiabatic tunneling, and that tunneling dynamics under the classically forbidden barrier can leave fingerprints on the resulting signals. Our findings have significant implications for the decoding of the intricate tunneling dynamics with attosecond angular streaking.

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来源期刊
Light-Science & Applications
Light-Science & Applications 数理科学, 物理学I, 光学, 凝聚态物性 II :电子结构、电学、磁学和光学性质, 无机非金属材料, 无机非金属类光电信息与功能材料, 工程与材料, 信息科学, 光学和光电子学, 光学和光电子材料, 非线性光学与量子光学
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803
审稿时长
2.1 months
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