Semiclassical calculation of ionisation rate for Rydberg helium atoms in an electric field

被引：0

作者：

王德华 ^{[1
]}

机构：

[1] College of Physics,Ludong University

来源：

Chinese Physics B | 2011年 / 20卷 / 01期

基金：

中国国家自然科学基金;

关键词：

ionisation rate; closed orbit theory; core scattering; pulse train;

D O I：

暂无

中图分类号：

O562 [原子物理学];

学科分类号：

070203 ; 1406 ;

摘要：

The ionisation of Rydberg helium atoms in an electric field above the classical ionisation threshold has been examined using the semiclassical method,with particular emphasis on discussing the influence of the core scattering on the escape dynamics of electrons.The results show that the Rydberg helium atoms ionise by emitting a train of electron pulses.Unlike the case of the ionisation of Rydberg hydrogen atom in parallel electric and magnetic fields,where the pulses of the electron are caused by the external magnetic field,the pulse trains for Rydberg helium atoms are created through core scattering.Each peak in the ionisation rate corresponds to the contribution of one core-scattered combination trajectory.This fact further illustrates that the ionic core scattering leads to the chaotic property of the Rydberg helium atom in external fields.Our studies provide a simple explanation for the escape dynamics in the ionisation of nonhydrogenic atoms in external fields.

引用

页码：332 / 336

页数：5

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