Dissociative Electron Attachment Cross Sections for H2 and D2

被引：44

作者：

Krishnakumar, E. ^{[1
,2
]}

Denifl, S. ^{[3
]}

Cadez, I. ^{[4
]}

Markelj, S. ^{[4
]}

Mason, N. J. ^{[2
]}

机构：

[1] Tata Inst Fundamental Res, Bombay 400005, Maharashtra, India

[2] Open Univ, Dept Phys & Astron, Milton Keynes MK7 6AA, Bucks, England

[3] Univ Innsbruck, Inst Ion Phys & Appl Phys, A-6020 Innsbruck, Austria

[4] Jozef Stefan Inst, Ljubljana 1000, Slovenia

来源：

PHYSICAL REVIEW LETTERS | 2011年 / 106卷 / 24期

关键词：

H2; HYDROGEN; IMPACT; D2; MOLECULES; HD;

D O I：

10.1103/PhysRevLett.106.243201

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

New measurements of the absolute cross sections for dissociative electron attachment (DEA) in molecular hydrogen and deuterium are presented which resolve previous ambiguities and provide a test bed for theory. The experimental methodology is based upon a momentum imaging time-of-flight spectrometer that allowed us to eliminate any contributions due to electronically excited metastable neutrals and ultraviolet light while ensuring detection of all the ions. The isotope effect in the DEA process in the two molecules is found to be considerably larger than previously observed. More importantly, it is found to manifest in the polar dissociation process (also known as ion pair production) as well.

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