# $S_{2} - S_{0}$ FLUOORESCENCE, MOLECULAR STRUCTRRE, AN INITIO CALCULATIONS, AND QUKANTUM BEAT SPECTROSCOPY OF SILYLIDENE $(H_{2}C=Si)$

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 Title: $S_{2} - S_{0}$ FLUOORESCENCE, MOLECULAR STRUCTRRE, AN INITIO CALCULATIONS, AND QUKANTUM BEAT SPECTROSCOPY OF SILYLIDENE $(H_{2}C=Si)$ Creators: Harper, Warren W.; Waddell, Kevin W.; Hilliard, Randall K.; Grev, Roger S.; Clouthier, Dennis J. Issue Date: 1997 Publisher: Ohio State University Abstract: Strong $S_{2}-S_{0}$ fluorescence has been observed in LIF spectra of jet-cooled silylidene, $H_{2}C=Si$, produced by fragmentation of tetramethylsilane in a pulsed discharge jet. The experimental ground and excited state molecular structures have been obtained for the first time from rotational analyses of the $0^{0}_{0}$ bands of $H_{2}C =$Si and $D_{2}C=Si$. These bands exhibit pronounced rotational level intensity anomalies indicative of nonradiative decay processes. Quantum beats are observed in the fluorescence decay of almost every rotational level in $v^{\prime} = 0$ and in most of the higher vibrational levels. Fourier transforms of the beat patterns show line broadening and splitting at small magnetic fields of 10-70 Gauss. High quality ab initio studies have been done to locate the interacting electronic states and predict their vibrational frequencies and molecular structures. Description: Author Institution: Department of Chemistry, University of Kentucky URI: http://hdl.handle.net/1811/14058 Other Identifiers: 1997-TD-08