Title

Variation of the C (KVV) Auger angular distribution in the C(1s) σ*-resonance of CO

Document Type

Article

Publication Date

4-1994

Publication Title

Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms

Publisher

Elsevier

Volume

87

Issue

1-4

First page number:

209

Last page number:

214

Abstract

We report on angle-resolved high-resolution measurements of C (KVV) Auger spectra of CO in the vicinity of the C (1s) sigma* -shape resonance above threshold. These spectra show clear evidence for the theoretically predicted anisotropic K-shell Auger emission in molecules. Complementary results from angle-resolved photoion-spectroscopy show that the small size of the observed effect is, besides the varying intrinsic anisotropy of the Auger decay, also due to a smaller anisotropy in the primary absorption process than originally predicted but in good agreement with more recent calculations. Contrary to this, some satellite Auger transitions show large anisotropies outside the shape resonance, an effect attributed to a conjugate shakeup transition in the primary photoionization process. All Auger anisotropies show a clear and distinct variation across the shape resonance which enables a distinction between different types of Auger transitions concerning the primary photoionization process.

Keywords

Angular distribution (Nuclear physics); Auger effect; Carbon monoxide; Photoelectron spectroscopy; Photoionization

Disciplines

Atomic, Molecular and Optical Physics | Physical Chemistry

Language

English

Permissions

Use Find in Your Library, contact the author, or use interlibrary loan to garner a copy of the article. Publisher copyright policy allows author to archive post-print (author’s final manuscript). When post-print is available or publisher policy changes, the article will be deposited.

Identifier

DOI: http://dx.doi.org/10.1016/0168-583X(94)95261-2

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