A doubly distorted-wave method for atomic ionization by ultrashort laser pulses
A doubly distorted-wave method for atomic ionization by ultrashort laser pulses
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超短激光脉冲原子电离的双畸变波方法
DOI：
10.1088/0953-4075/45/1/015601
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发表时间：
2012
期刊：
影响因子：
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通讯作者：
M. Ciappina
中科院分区：
文献类型：
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作者：
M. S. Gravielle;D. Arbó;J. Miraglia;M. Ciappina
我们研究了短激光脉冲原子电离的时间相关畸变波公式，称为双畸变库仑-沃尔科夫（DDCV）近似。该方法考虑了初始通道和最终通道中激光场通过沃尔科夫相位引入的畸变。 DDCV 模型用于评估多周期激光脉冲电离的氢原子的电子发射分布。考虑到激光场的不同强度和频率，将结果与基于瞬态薛定谔方程 (TDSE) 数值解的精确治疗预测以及标准库仑-沃尔科夫 (CV) 方法得出的值进行比较。对于高于 0.1 au 的激光频率，与 TDSE 解决方案获得了良好的一致性，扩展了常用 CV 型方法的适用范围。
We study a time-dependent distorted-wave formulation of atomic ionization by short laser pulses named the double-distorted Coulomb–Volkov (DDCV) approximation. The method takes into account the distortions introduced by the laser field in the initial and final channels, both by means of the Volkov phase. The DDCV model is applied to evaluate electron emission distributions for hydrogen atoms ionized by multi-cycle laser pulses. Results are compared with the predictions of an exact treatment based on the numerical solution of the time-dependent Schrödinger equation (TDSE) and with values derived from the standard Coulomb–Volkov (CV) approach, considering different intensities and frequencies of the laser field. Good agreement with the TDSE solution has been obtained for laser frequencies higher than 0.1 au, extending the range of applicability of the usual CV-type methods.