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Infrared spectrum of the silicon hydride cation SiH_7^+

Cao, Yi-Bin and Choi, Jong-Ho and Haas, Bernd-Michael and Johnson, Matthew S. and Okumura, Mitchio (1993) Infrared spectrum of the silicon hydride cation SiH_7^+. In: Laser Techniques for State-Selected and State-to-State Chemistry. Proceedings of SPIE. No.1858. Society of Photo-Optical Instrumentation Engineers (SPIE) , Bellingham, WA, pp. 326-331. ISBN 0-8194-1085-3.

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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 ^(28)SiH_7^+ 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 H_2⋅SiH_3^+⋅H_2, in contrast to the CH_7^+ which has the structure CH_5^+⋅H_2.

Item Type:Book Section
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Okumura, Mitchio0000-0001-6874-1137
Additional Information:© 1993 Society of Photo-Optical Instrumentation Engineers (SPIE). 22 April 1993. We gratefully acknowledge the support of a National Science Foundation Presidential Young Investigator Award CHEM-8957243 and an AT&T Special Purpose Grant. Additional support was received from a Dreyfus Newly Appointed Faculty Award, the Irvine Foundation, the Chevron Fund, and a Department of Education Fellowship (MSJ). We would like to thank D. W. Boo and Prof. Y. T. Lee for their unpublished results.
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Camille and Henry Dreyfus FoundationUNSPECIFIED
Irvine FoundationUNSPECIFIED
Department of EducationUNSPECIFIED
Series Name:Proceedings of SPIE
Issue or Number:1858
Record Number:CaltechAUTHORS:20170918-133537969
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Official Citation:Yi-Bin Cao, Jong-Ho Choi, Bernd-Michael Haas, Matthew S. Johnson, Mitchio Okumura, "Infrared spectrum of the silicon hydride cation SiH7+", Proc. SPIE 1858, Laser Techniques for State-Selected and State-to-State Chemistry, (22 April 1993);
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:81533
Deposited By: Ruth Sustaita
Deposited On:19 Sep 2017 20:46
Last Modified:03 Oct 2019 18:43

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