An improved quantum trajectory Monte Carlo method including the Stark shift of the initial state, Coulomb potential, and multielectron polarization-induced dipole potential is adopted to revisit the origin of the low-energy interference structure in the photoelectron momentum distribution of the xenon atom subjected to an intense laser field, and resolve the different contributions of these three effects. We found that the Stark shift plays an essential role on the low-energy interference structure, which moves the ringlike constructive interference structure to the lower momentum region. The formation of the low-energy interference structure is a result of the combined effects of Stark shift, laser, and Coulomb fields, while the multielectron polarization mainly enhance the probability of the low energy photoelectron spectrum. Our finding provides insight into the electron dynamics of atoms and molecules when driven by the intense laser fields.

中文翻译：

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斯塔克位移对强场电离中低能干扰结构的影响

采用改进的量子轨迹蒙特卡罗方法，包括初始态的斯塔克频移，库仑势和多电子极化诱导的偶极势，以重新研究低能干涉结构在氙原子的光电子动量分布中的起源。强烈的激光场，并解决了这三种效应的不同贡献。我们发现，斯塔克频移在低能干涉结构中起着至关重要的作用，这种结构将环状的相长干涉结构移到了较低的动量区域。低能干涉结构的形成是斯塔克位移，激光和库仑场的综合作用的结果，而多电子极化主要增加了低能光电子谱的可能性。