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中国物理学会期刊

用推广的量子轨迹蒙特卡罗方法研究强场光电子全息

CSTR: 32037.14.aps.65.223207

Strong field photoelectron holography studied by a generalized quantum-trajectory Monte Carlo method

CSTR: 32037.14.aps.65.223207
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  • 强场光电子全息因其二维光电子动量谱中携带着电子和离子的时空动力学信息,所以在实验中被发现后迅速成为近年来强场超快物理中的一个热点研究领域.本文主要介绍一种推广的量子轨迹蒙特卡罗计算方法.利用这种方法可在更广泛的实验条件下探讨原子分子光电子全息现象背后深层次的物理机理.与含时薛定谔方程的对比发现利用推广的量子轨迹蒙特卡罗方法计算的光电子全息干涉结构的截止能量位置能清楚地反映非绝热隧穿电离效应.而且,我们发现了深隧穿电离条件下一种新颖的圆环干涉结构.这一圆环状干涉结构遮蔽了光电子全息条纹,因此,这一结果表明:深隧穿区并非是形成光电子全息的有利实验条件.在非绝热隧穿区,长程库仑势对于光电子全息的形成起着至关重要的作用.

     

    Strong-field photoelectron holography encodes detailed temporal and spatial information about both theelectron and ion dynamics. Here, we review a series of numerical studies of strong-field photoelectron holographyin atoms and molecules by a generalized quantum-trajectory Monte Carlo method. By comparingthe generalized quantum-trajectory Monte Carlo simulationwiththe numerical solution of thetime-dependent Schrdinger equation, we demonstrate that, in the nonadiabatic tunneling regime, pronounced nonadiabatic effects occur which manifest in the energy cutoff of the holographic interference structure. Moreover, we found that a profound ring-like pattern can be observed in the deep tunneling ionization regime. Theappearance of the ring-like interference pattern masks the holographic interference structure. In contrast to the tunneling regime, the long-range Coulomb potential is found to play an essential role in the formation of the photoelectron holography in the nonadiabatic tunneling regime.

     

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