物理
电场
电子
Wannier函数
凝聚态物理
领域(数学)
电位
极化密度
电通量
作者
Bruno Eckhardt,Krzysztof Sacha
出处
期刊:EPL
[IOP Publishing]
日期:2001-12-01
卷期号:56 (5): 651-657
被引量:18
标识
DOI:10.1209/epl/i2001-00570-7
摘要
We consider double ionization of atoms or ions by electron impact in the presence of a static electric field. As in Wanniers analysis of the analogous situation without external field the dynamics near threshold is dominated by a saddle. With a field the saddle lies in a subspace of symmetrically escaping electrons. Near threshold the classical cross-section scales with excess energy E like σ ~ Eα, where the exponent α can be determined from the stability of the saddle and does not depend on the field strength. For example, if the remaining ion has charge Z = 2, the exponent is 1.292, significantly different from the 1.056 without the field.
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