# DISPERSED FLUORESCENCE SPECTRA OF SIMPLE CARBENES

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 Title: DISPERSED FLUORESCENCE SPECTRA OF SIMPLE CARBENES Creators: Chang, Bor-Chen; Bezant, Andrew J.; Miller, Terry A. Issue Date: 2000 Publisher: Ohio State University Abstract: The electronic excitation spectra of simple carbenes such as $CCl_{2}$, $HCCl$, and $HCBr$ were found to be complicated due to Renner-Teller effects, spin-orbit couplings, and Fermi $resonances.^{a}$ Information on the ground electronic state structure is crucial to unravel the interplay between these interactions, as well as being valuable in its own right. We have adopted the combination of a DC electrical discharge free jet source and laser-induced fluorescence (LIF) to record the dispersed fluorescence spectra of these simple carbenes. The dispersed fluorescence spectra of $CCl_{2}$ reveal the vibrational structure of the $\widetilde{X}$ state. Comparison with previous data from cryogenic matrix $work^{b}$ and recent theoretical $calculations^{c}$ will be discussed. Progress on the dispersed fluorescence experiments of other carbenes, such as $HCBr$ and $HCCl$, will also be presented. Description: Acknowledgments: BCC thanks Dr. Kopin Liu (Academia Sinica, Taiwan) for help with the experiment and the National Science Council, Taiwan for its support of this work under Grant No. NSC88-2113-M-008-007.$^{a}$D. J. Clouthier and J. Karolczak, J. Chem. Phys. 94, 1 (1991). $^{b}$V. E. Bondybey. J. Mol. Spectrosc. 64, 180 (1977). $^{c}$K. Sendt and G. B. Bacskay. J. Chem. Phys. 112, 2227 (2000). Author Institution: Department of Chemistry, National Central University; Laser Spectroscopy Facility, Department of Chemistry, The Ohio State University URI: http://hdl.handle.net/1811/19808 Other Identifiers: 2000-TA-03