强X射线场电离中的非偶极库仑效应

中文摘要 AI 辅助

通过数值求解包含非偶极修正的含时薛定谔方程，研究了超强X射线场中的原子电离。在线性偏振激光场中，分析了原子核库仑势在非偶极区域的作用。在所考虑的高频和高强度稳定化区域，光电子谱由近零能量结构主导，而阈上电离峰被抑制。基于库仑动量转移的标度，识别出非偶极情况下的两个子区域，此时激光场相互作用期间的库仑效应要么显著，要么次要。库仑影响区域出现在相对较低的场强、较高的激光频率和较长的脉冲持续时间内。提供了一个直观模型，解释了光电子动量分布中的不同特征和库仑效应的标度。

英文摘要

Atomic ionization in superintense x-ray fields is studied through numerical solutions of the time-dependent Schrödinger equation including nondipole corrections. The role of the Coulomb potential of the atomic core in the nondipole regime is analyzed for a linearly polarized laser field. In the considered high-frequency and high-intensity stabilization regime, the photoelectron spectra are dominated by a near-zero-energy structure, while above-threshold ionization peaks are suppressed. Two sub-regimes in the nondipole case are identified based on the scaling of the Coulomb momentum transfer, when the Coulomb effect during the interaction with the laser field is either significant or minor. The Coulomb influenced regime sets in within the realm of relatively low field strengths, high laser frequencies, and long pulse durations. An intuitive model explaining the distinct features in the photoelectron momentum distributions and the Coulomb effect scaling is provided.

发表机构

• Max-Planck-Institut für Kernphysik（马克斯·普朗克核物理研究所）

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