Atomic Siegert states in an electric field: Transverse momentum distribution of the ionized electrons
Atomic Siegert states in an electric field: Transverse momentum distribution of the ionized electrons
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DOI：
10.1103/physreva.82.023416
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发表时间：
2010-08
影响因子：
2.9
通讯作者：
P. A. Batishchev;O. Tolstikhin;T. Morishita
中科院分区：
文献类型：
--
作者：
P. A. Batishchev;O. Tolstikhin;T. Morishita
本文讨论了静态均匀电场中原子的Siegert态，定义为满足正则性和行波边界条件的定态Schroedinger方程的解。本文介绍了一种计算一般单电子原子势的复能量本征值和本征函数的有效方法。本文导出了电离电子横向动量分布在渐近区用Siegert本征函数表示的精确表达式。该方法是通过计算的能量，电离宽度，和横向动量分布作为电场的函数的几个最低状态的H，外p壳层的Ne，Ar，Kr，和H2，和H{sup -}中的活性电子。我们还讨论了单向含时电场脉冲对Ar原子的电离，说明了Siegert态在最近发展的强激光脉冲电离原子绝热理论中的作用[O. I. Tolstikhin等人，A 81，033415（2010）]。
The Siegert states of atoms in a static uniform electric field, defined as the solutions to the stationary Schroedinger equation satisfying the regularity and outgoing-wave boundary conditions, are discussed. An efficient method to calculate not only the complex energy eigenvalue, but also the eigenfunction for a general class of one-electron atomic potentials is introduced. An exact expression for the transverse momentum distribution of the ionized electrons in terms of the Siegert eigenfunction in the asymptotic region is derived. The method is illustrated by calculations of the energy, ionization width, and transverse momentum distribution as functions of the electric field for several lowest states of H, outer p shells of Ne, Ar, Kr, and Xe, and the active electron in H{sup -}. We also discuss the ionization of Ar by the pulse of a unidirectional time-dependent electric field, which illustrates the role of the Siegert states in the recently developed adiabatic theory of ionization of atoms by intense laser pulses [O. I. Tolstikhin et al., Phys. Rev. A 81, 033415 (2010)].