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Orbital angular momentum (Renner-Teller) effects in the (2)Pi(i) ground state of silicon methylidyne (SiCH)

TitleOrbital angular momentum (Renner-Teller) effects in the (2)Pi(i) ground state of silicon methylidyne (SiCH)
Publication TypeJournal Article
Year of Publication2001
AuthorsSmith, TC, Li, HY, Hostutler, DA, Clouthier, DJ, Merer, AJ
JournalJournal of Chemical Physics
Volume114
Pagination725-734
Date PublishedJan
Type of ArticleArticle
ISBN Number0021-9606
KeywordsELECTRONIC-SPECTRUM, FERMI-RESONANCE INTERACTIONS, GAS-PHASE, MOLECULAR-STRUCTURE, MONOFLUOROSILYLENE, PYROLYSIS JET SPECTROSCOPY, SIMPLEST UNSATURATED SILYLENE, spin-orbit, TRIATOMIC-MOLECULES, VIBRATIONAL FREQUENCIES
Abstract

The ground state vibrational energy levels of jet-cooled SiCH and SiCD have been studied by a combination of laser-induced fluorescence and wavelength-resolved fluorescence techniques. The radicals were produced by a pulsed electric discharge at the exit of a supersonic expansion using tetramethylsilane or methyltrichlorosilane as the precursor. Emission spectra have been obtained by pumping both perpendicular and parallel (vibronically induced) bands, providing complementary information on the Si-C stretching and Si-C-H bending modes. Ground state energy levels up to 4000 cm(-1) have been assigned and fitted using a vibrational Hamiltonian that incorporates Renner-Teller, spin-orbit, vibrational anharmonicity, and Fermi resonance interactions. The validity of the derived parameters has been tested using the isotope relations. (C) 2001 American Institute of Physics.

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