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100% site-selective fragmentation in core-hole-photoexcited methanol by anion-yield spectroscopy

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W C Stolte1,2, G Öhrwall1,5, M M Sant'Anna2,6, I Dominguez Lopez3, L T N Dang1, M N Piancastelli4 and D W Lindle1

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LETTER TO THE EDITOR

Anion-yield spectroscopy is shown to provide the first experimental demonstration of 100% site selectivity in small-molecule photofragmentation processes. In methanol, CH3OH, creation of the anionic OH- fragment occurs only via resonant excitation below the carbon K edge; the fragment is completely absent near the oxygen K edge. This observation and comparison of all anion and cation partial yields confirm the existence of at least two mechanisms for the creation of anions near the carbon K edge.


PACS

82.30.Lp Decomposition reactions (pyrolysis, dissociation, and fragmentation)

82.50.-m Photochemistry

Subjects

Chemical physics and physical chemistry

Dates

Issue 12 (28 June 2002)

Received 16 April 2002, in final form 16 May 2002

Published 6 June 2002



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