UV laser multiphoton ionization—dissociation of phenylsilane and its homogeneous dimers

Homogeneous dimers of phenylsilane, formed in a rare-gas seeded supersonic expansion have been studied by laser resonant two-photon ionization combined with a time-of-flight mass spectrometer. The resonant intermediate states are the S 1 (270 nm) and S 2 (210 nm) ones. The ionization of phenylsilane...

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Bibliographic Details
Published in:International journal of mass spectrometry and ion processes 1998, Vol.173 (1), p.143-151
Main Authors: Kosmidis, Constantine, Philis, John G.
Format: Article
Language:English
Subjects:
Clusters
Fragmentation
Intracluster reactions
Ionization
Phenylsilane
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Summary:Homogeneous dimers of phenylsilane, formed in a rare-gas seeded supersonic expansion have been studied by laser resonant two-photon ionization combined with a time-of-flight mass spectrometer. The resonant intermediate states are the S 1 (270 nm) and S 2 (210 nm) ones. The ionization of phenylsilane monomer is inefficient at 210 nm whereas phenylsilane homo-dimers are resonantly ionized with high efficiency at this wavelength region. The wavelength dependence of the dimer at S 1← S 0 origin region implies the existence of at least two, almost isoenergetic, dimer conformers in the molecular beam. Photoionization of phenylsilane dimer induces chemical reactions within the dimer. The detected dissociation channels have to do with −SiH 3 and −C 6H 6 loss and proton-transfer. Van der Waals fragmentation (evaporation of a neutral phenylsilane) is also taking place.
ISSN:0168-1176
1873-2801
DOI:10.1016/S0168-1176(97)00284-X