Adiabatic theory of ionization by intense laser pulses: Finite-range potentials
Adiabatic theory of ionization by intense laser pulses: Finite-range potentials
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DOI：
10.1103/physreva.86.043417
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发表时间：
2012-10
影响因子：
2.9
通讯作者：
O. Tolstikhin;T. Morishita
中科院分区：
文献类型：
--
作者：
O. Tolstikhin;T. Morishita
本文发展了强低频激光脉冲电离三维势阱中电子的绝热理论。在单激活电子近似下，讨论了激光场和任意势的任意时间依赖性和偏振性的一般情况，其中任意势可以模拟原子或分子，唯一的限制是势不能有库仑尾。得到了含时薛定谔方程解的渐近性和绝热区光电子动量分布。考虑了波函数和电离振幅的绝热和再散射部分。这些渐近性表示在Siegert状态起源于初始的束缚态中存在的静电场和散射状态中的未扰动电位。它们是统一的激光场的振幅，并适用于弱underbarrier以及强overbarrier领域，提供的条件定义的区域的绝热近似的有效性得到满足。该理论说明了计算确认的绝热结果收敛到确切的绝热参数趋于零。
The adiabatic theory of ionization of an electron, initially bound in a three-dimensional potential well, by an intense low-frequency laser pulse is developed. The general case of arbitrary time dependence and polarization of the laser field and arbitrary potential which can model an atom or a molecule in the single-active-electron approximation is treated, with the only restriction that the potential should not have a Coulomb tail. The asymptotics of the solution to the time-dependent Schrödinger equation and photoelectron momentum distribution in the adiabatic regime are obtained. Both the adiabatic and the rescattering parts of the wave function and ionization amplitude are considered. These asymptotics are expressed in terms of the Siegert state originating from the initial bound state in the presence of a static electric field and scattering states in the unperturbed potential. They are uniform in terms of the amplitude of the laser field and apply to weak underbarrier as well as strong overbarrier fields, provided the condition defining the region of validity of the adiabatic approximation is fulfilled. The theory is illustrated by calculations which confirm that the adiabatic results converge to the exact ones as the adiabatic parameter tends to zero.