Photoionization and compton double ionization of helium from threshold to 20 keV

被引：96

作者：

Levin, JC

Armen, GB

Sellin, IA

机构：

[1] Department of Physics, University of Tennessee, Knoxville, TN

来源：

PHYSICAL REVIEW LETTERS | 1996年 / 76卷 / 08期

关键词：

D O I：

10.1103/PhysRevLett.76.1220

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report new measurements of He++/He+ ratios in three energy ranges. Near threshold, where only photoionization contributes, we find a ratio systematically lower than previously published measurements. From 2 to 6 keV, where Compton ionization gradually supplants photoionization as the dominant ionization mechanism, theory and experiment are in substantial agreement. Far above threshold where Compton ionization dominates, theories diverge markedly. Comparison with present results indicates asymptotic values have been established for photoionization bur not Compton ionization.

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页码：1220 / 1223

页数：4

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