# ELECTRONIC SPECTROSCOPY OF THE JET-COOLED HPC1 FREE RADICAL

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 Title: ELECTRONIC SPECTROSCOPY OF THE JET-COOLED HPC1 FREE RADICAL Creators: Tackett, Brandon S.; He, Sheng-Gui; Evans, Corey J.; Clouthier, Dennis J.; Judge, R. H. Issue Date: 2003 Publisher: Ohio State University Abstract: The $\tilde{A}^{2}A^{\prime} - \tilde{X}^{2} A^{\prime\prime}$ electronic transition of the HPC1 free radical has been observed by laser-induced fluorescence (LIF) spectroscopy in the $458 - 400$ nm region. HPC1 and DPC1 were generated in a pulsed discharge jet using a precursor mixture of $PCl_{3}$ and $H_{2}$ or $D_{2}$ in argon. At low resolution the bands have the characteristic rotational contour of a perpendicular transition of an asymmetric top, with additional axis switching branches due to the low symmetry of the molecule. At high resolution, small $K_{a}$ dependent spin splittings are found which confirm that the molecule contains a single unpaired electron. Our studies of the LIF and wavelength resolved emission spectra have established most of the vibrational frequencies of HPCl and DPCl and the molecular structures in the ground and excited states have been obtained from rotational analyses of the $0_{0}^{0}$ bands of both isotopomers. The analysis of the spectra, rotational constants, vibrational frequencies, molecular geometries and the results of CCSD(T) ab initio calculations of the molecular parameters will be discussed. Description: Author Institution: Department of Chemistry, University of Kentucky; Department of Chemistry, University of Wisconsin-Parkside URI: http://hdl.handle.net/1811/21083 Other Identifiers: 2003-WF-06