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Proceedings Paper

Infrared spectrum of the silicon hydride cation SiH7+
Author(s): Yi-Bin Cao; Jong-Ho Choi; Bernd-Michael Haas; Matthew S. Johnson; Mitchio Okumura
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Paper Abstract

Silanium ions are an important class of hypervalent molecules, and the determination of their structure will yield insights into the nature of nonclassical bonding and provide a contrast to the bonding in carbonium ions. We report the infrared spectrum of the mass-selected silicon hydride cluster ion (formula available in paper) detected by vibrational predissociation spectroscopy. Silanium ions were formed in a pulsed high pressure glow discharge and cooled by the subsequent supersonic expansion. Photodissociation spectra were obtained using a tandem time-of-flight mass spectrometer: (formula available in paper) ions were mass-selected and excited by a tunable infrared laser. The resulting photofragments were detected using a reflectron as a mass analyzer. We observed a vibrational band at 3865 cm-1, which was the only one observed from 3500 cm-1 to 4200 cm-1. This result suggests that the molecule might form a symmetric complex with the structure H2(DOT)SiH3+(DOT)H2, in contrast to the (formula available in paper) which has the structure CH5+(DOT)H2.

Paper Details

Date Published: 22 April 1993
PDF: 6 pages
Proc. SPIE 1858, Laser Techniques for State-Selected and State-to-State Chemistry, (22 April 1993); doi: 10.1117/12.143114
Show Author Affiliations
Yi-Bin Cao, California Institute of Technology (United States)
Jong-Ho Choi, California Institute of Technology (United States)
Bernd-Michael Haas, California Institute of Technology (United States)
Matthew S. Johnson, California Institute of Technology (United States)
Mitchio Okumura, California Institute of Technology (United States)


Published in SPIE Proceedings Vol. 1858:
Laser Techniques for State-Selected and State-to-State Chemistry
Cheuk Yiu Ng, Editor(s)

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