Song Xiaohong, Lin Cheng, Sheng Zhihao, Liu Peng, Chen Zhangjin, Yang Weifeng, Hu Shilin, Lin C D, Chen Jing
Department of Physics, College of Science, Shantou University, Shantou, Guangdong 515063, People's Republic of China.
HEDPS, Center for Applied Physics and Technology, Peking University, Beijing 100084, People's Republic of China.
Sci Rep. 2016 Jun 22;6:28392. doi: 10.1038/srep28392.
Strong field photoelectron holography has been proposed as a means for interrogating the spatial and temporal information of electrons and ions in a dynamic system. After ionization, part of the electron wave packet may directly go to the detector (the reference wave), while another part may be driven back and scatters off the ion(the signal wave). The interference hologram of the two waves may be used to extract target information embedded in the collision process. Unlike conventional optical holography, however, propagation of the electron wave packet is affected by the Coulomb potential as well as by the laser field. In addition, electrons are emitted over the whole laser pulse duration, thus multiple interferences may occur. In this work, we used a generalized quantum-trajectory Monte Carlo method to investigate the effect of Coulomb potential and the nonadiabatic subcycle ionization on the photoelectron hologram. We showed that photoelectron hologram can be well described only when the effect of nonadiabatic ionization is accounted for, and Coulomb potential can be neglected only in the tunnel ionization regime. Our results help paving the way for establishing photoelectron holography for probing spatial and dynamic properties of atoms and molecules.
强场光电子全息术已被提出作为一种探测动态系统中电子和离子的空间和时间信息的手段。电离后，部分电子波包可能直接到达探测器（参考波），而另一部分可能被驱回并与离子发生散射（信号波）。这两束波的干涉全息图可用于提取碰撞过程中嵌入的目标信息。然而，与传统光学全息术不同，电子波包的传播受到库仑势以及激光场的影响。此外，电子在整个激光脉冲持续时间内发射，因此可能会发生多次干涉。在这项工作中，我们使用广义量子轨迹蒙特卡罗方法来研究库仑势和非绝热子周期电离对光电子全息图的影响。我们表明，只有考虑非绝热电离的影响时，光电子全息图才能得到很好的描述，并且只有在隧道电离区域才能忽略库仑势。我们的结果有助于为建立用于探测原子和分子的空间和动态特性的光电子全息术铺平道路。
