论文标题
由X射线自由电子激光脉冲诱导的霓虹子原子的状态分辨电离动力学
State-resolved ionization dynamics of neon atom induced by x-ray free-electron-laser pulses
论文作者
论文摘要
我们提出了一个理论框架，以描述由超明X射线自由电子激光脉冲驱动的霓虹原子的状态分辨电离动力学。通常，原子的X射线多光子离子化动力学已经通过在电离动力学期间访问的电子构型的时间依赖性人群来描述，从而忽略了个别状态对状态的过渡速率和能量。基于一阶多体扰动理论的状态分辨的电子结构计算与蒙特卡洛速率方程方法相结合，使我们能够基于时间依赖性状态人群研究状态分辨的动态。我们的结果表明，基于构型和状态分辨的计算提供了相似的电荷状态分布，但是当涉及谐振激发时，差异是可见的，这也反映在计算出的时间集成电子和光子光谱中。另外，分析了不同的脉冲持续时间的离子，电子和光子的时间分辨光谱，以探索沮丧的吸收在霓虹原子的电离动力学过程中如何表现出来。
We present a theoretical framework to describe state-resolved ionization dynamics of neon atoms driven by ultraintense x-ray free-electron-laser pulses. In general, x-ray multiphoton ionization dynamics of atoms have been described by time-dependent populations of the electronic configurations visited during the ionization dynamics, neglecting individual state-to-state transition rates and energies. Combining a state-resolved electronic-structure calculation, based on first-order many-body perturbation theory, with a Monte Carlo rate-equation method, enables us to study state-resolved dynamics based on time-dependent state populations. Our results demonstrate that configuration-based and state-resolved calculations provide similar charge-state distributions, but the differences are visible when resonant excitations are involved, which are also reflected in calculated time-integrated electron and photon spectra. In addition, time-resolved spectra of ions, electrons, and photons are analyzed for different pulse durations to explore how frustrated absorption manifests itself during the ionization dynamics of neon atoms.
