ABSOLUTE TRIPLE DIFFERENTIAL CROSS-SECTION FOR IONIZATION OF HELIUM NEAR THRESHOLD

被引：63

作者：

ROSEL, T ^{[1
]}

RODER, J ^{[1
]}

FROST, L ^{[1
]}

JUNG, K ^{[1
]}

EHRHARDT, H ^{[1
]}

JONES, S ^{[1
]}

MADISON, DH ^{[1
]}

机构：

[1] UNIV MISSOURI, ATOM & MOLEC COLLIS LAB, ROLLA, MO 65401 USA

来源：

PHYSICAL REVIEW A | 1992年 / 46卷 / 05期

关键词：

D O I：

10.1103/PhysRevA.46.2539

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

Absolute measurements with an accuracy of 22% and theoretical results in a distorted-wave Born approximation (DWBA) are reported for the triple-differential cross section for 26.6-eV electron-impact ionization of helium. An apparatus is used that allows all scattering angles to be independently varied for both coplanar and noncoplanar geometries. The measurements are compared with a DWBA calculation that includes exchange distortion in the calculation of the distorted waves, as well as with earlier calculations by Crothers [J. Phys. B 19, 463 (1986)] and Pan and Starace [Phys. Rev. Lett. 67, 185 (1991)]. Emphasis is placed on understanding the mechanisms for near-threshold ionization.

引用

页码：2539 / 2552

页数：14

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