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 28SiH7 +, 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: SiH7 + 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·SiH3 +·H2, in contrast to the species CH 7 +, which has the structure CH5 +·H2.
|Title of host publication||Proceedings of SPIE - The International Society for Optical Engineering|
|Place of Publication||Bellingham, WA, United States|
|Publisher||Publ by Int Soc for Optical Engineering|
|Number of pages||6|
|Publication status||Published - 1993 Dec 1|
ASJC Scopus subject areas
- Electrical and Electronic Engineering