Ionization of the hydrogen atom by short half-cycle pulses: dependence on the pulse duration

被引：0
|
作者：
D. G. Arbó
M. S. Gravielle
K. I. Dimitriou
K. Tőkési
S. Borbély
J. E. Miraglia
机构：
[1] Institute for Astronomy and Space Physics,Department of Physics, FCEN
[2] IAFE,Department of Physical Science and Applications
[3] University of Buenos Aires,Department of Informatics
[4] Hellenic Army Academy,Institute of Theoretical and Chemical Physics
[5] Technological Educational Institution,Faculty of Physics
[6] National Hellenic Research Foundation,undefined
[7] Institute of Nuclear Research of the Hungarian Academy of Science,undefined
[8] ATOMKI,undefined
[9] Babes-Bolyai University,undefined
来源：
The European Physical Journal D | 2010年 / 59卷
关键词：
Pulse Duration; Momentum Transfer; Ionization Probability; Classical Trajectory Monte Carlo; Electron Initial Condition;
D O I：
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中图分类号：
学科分类号：
摘要：
A theoretical study of the ionization of hydrogen atoms by short external half-cycle pulses (HCPs) as a function of the pulse duration, using different quantum and classical approaches, is presented. Total ionization probability and energy distributions of ejected electrons are calculated in the framework of the singly-distorted Coulomb-Volkov (SDCV) and the doubly-distorted Coulomb-Volkov (DDCV) approximations. We also performed quasiclassical calculations based on a classical trajectory Monte Carlo method which includes the possibility of tunneling (CTMC-T). Quantum and classical results are compared to the numerical solution of the time-dependent Schrödinger equation (TDSE). We find that for high momentum transfers the DDCV shows an improvement compared to the SDCV, especially in the low-energy region of the electron emission spectra, where SDCV fails. In addition, DDCV reproduces successfully the TDSE electron energy distributions at weak momentum transfers. CTMC-T results reveal the importance of tunneling in the ionization process for relative long pulses and strong momentum transfers but fails to overcome the well-known classical suppression observed for weak electric fields.
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页码：193 / 200
页数：7
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