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Ultraviolet and Infrared Photodissociation of Si+(C6H6)n and Si+(C6H6)nAr Clusters

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Department of Chemistry, University of Georgia, Athens, Georgia 30602-2556
Cite this: J. Phys. Chem. A 2005, 109, 12, 2801–2808
Publication Date (Web):March 5, 2005
https://doi.org/10.1021/jp044798a
Copyright © 2005 American Chemical Society
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    Abstract

    Ion−molecule complexes of the form Si+(C6H6)n and Si+(C6H6)nAr are produced by laser vaporization in a pulsed nozzle cluster source. These clusters are mass-selected and studied with ultraviolet (355 nm) photodissociation and resonance-enhanced infrared photodissociation spectroscopy in the C−H stretch region of benzene. In the UV, Si+(C6H6)n clusters (n = 1−5) fragment to produce the Si+(C6H6) mono-ligand species, suggesting that this ion has enhanced relative stability. IR photodissociation of Si+(C6H6)n complexes occurs by the elimination of benzene, while Si+(C6H6)nAr complexes lose Ar. Resonances reveal C−H vibrational bands in the 2900−3300 cm-1 region characteristic of the benzene ligand with shifts caused by the silicon cation bonding. The IR spectra confirm that the major component of the Si+(C6H6) ions studied have the π-complex structure rather than the isomeric insertion products suggested previously.

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     Corresponding author. E-mail:  [email protected].

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