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# INFRARED CAVITY RINGDOWN SPECTROSCOPY OF JET-COOLED PAHS: A COMPARISON WITH MATRIX SPECTRA

Please use this identifier to cite or link to this item: http://hdl.handle.net/1811/20826

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 Title: INFRARED CAVITY RINGDOWN SPECTROSCOPY OF JET-COOLED PAHS: A COMPARISON WITH MATRIX SPECTRA Creators: Huneycutt, A. J.; Casaes, R.; McCall, Benjamin J.; Saykally, R. J.; Chung, Chao-Yu; Lee, Yuan-Pern Issue Date: 2003 Abstract: Infrared absorption spectra of the CH stretching region were observed for naphthalene, anthracene, phenanthrene, pyrene, and perylene using a heated supersonic slit source and cavity ringdown spectroscopy. Results are compared closely with 10 K Ar matrix spectra to detemine general matrix perturbation effects for this class of molecules. Fundamental transitions in the matrix spectra were subject to spectral shifts of up to $3.0 cm^{-1}$ and band widths were generally broader than the jet-cooled spectra by up to 80%. Weak features not predicted by theory were observed in both Ar matrix and gas-phase spectra with similar relative intensities which suggest assignment to overtones and combination bands. URI: http://hdl.handle.net/1811/20826 Other Identifiers: 2003-MI-03