Title

Core to valence transitions in methane

Authors

Authors

S. P. Frigo; A. Menzel;C. D. Caldwell

Comments

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Abbreviated Journal Title

Chem. Phys. Lett.

Keywords

PHOTOABSORPTION; PHOTOELECTRON; SPECTROSCOPY; MOLECULES; STATES; DECAY; CH4; Chemistry, Physical; Physics, Atomic, Molecular & Chemical

Abstract

We have identified and characterized 1a(1) core electron transitions to states involving the anti-bonding 2t(2) sigma* virtual orbital in methane. The 1t(2) autoionization branching ratio indicates that the excitations lie at the same energies as the Rydberg resonances observed in total absorption. The corresponding 1t(2) angular distribution parameter reflects coupling of electron and nuclear coordinates. Changes in the 1t(2) kinetic energy distribution are explained by nuclear motion during the core-hole lifetime due to repulsive potential energy surfaces. The data indicate that 1a(1) core-excited states involving the valence 2t(2) sigma* molecular orbital are split by the Jahn-Teller effect into bands which are much broader than any Rydberg features. These results illustrate the value of valence emission as a probe of resonant molecular core-excited states. (C) 1998 Published by Elsevier Science B.V. All rights reserved.

Journal Title

Chemical Physics Letters

Volume

288

Issue/Number

1

Publication Date

1-1-1998

Document Type

Article

Language

English

First Page

98

Last Page

104

WOS Identifier

WOS:000073721800016

ISSN

0009-2614

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