Core to valence transitions in methane

    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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