# THE ELECTRONIC SPECTRUM AND MOLECULAR STRUCTURE OF THE JET-COOLED SILICON METHYLIDYNE (SiCH) RADICAL

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 Title: THE ELECTRONIC SPECTRUM AND MOLECULAR STRUCTURE OF THE JET-COOLED SILICON METHYLIDYNE (SiCH) RADICAL Creators: Smith, Tony C.; Li, Haiyang; Clouthier, Dennis J.; Kingston, C. T.; Merer, A. J. Issue Date: 1999 Publisher: Ohio State University Abstract: Small hydrogen-containing silicon-carbon compounds are important as potential precursors to the $SiC_{n}$ clusters found in stellar atmospheres. In this work, we have observed the $\widetilde{A} {^{2}}\Sigma^{+} - \widetilde{X} {^{2}}\Pi_{i}$ electronic transition of the jet-cooled silicon methylidyne radical, produced by fragmentation of tetramethylsilane in a pulsed discharge jet. Extensive systems of rotationally discrete bands of both SiCH and SiCD have been observed in the $855 - 605 nm$ region. Use of a reheat tube'' at the exit of the jet has allowed us to observe both spin-orbit components, which have a $70cm^{-1}$ separation. High resolution spectra have been obtained for both SiCH and SiCD, providing rotational constants and molecular structures for the ground and excited states. Description: Author Institution: Department of Chemistry, University of Kentucky; Chemistry Department, University of British Columbia URI: http://hdl.handle.net/1811/19399 Other Identifiers: 1999-RI-10