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Infrared Cavity Ringdown Spectroscopy of Jet‐Cooled Polycyclic Aromatic Hydrocarbons
Author(s) -
Huneycutt Alex J.,
Casaes Raphael N.,
McCall Benjamin J.,
Chung ChaoYu,
Lee YuanPern,
Saykally Richard J.
Publication year - 2004
Publication title -
chemphyschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.016
H-Index - 140
eISSN - 1439-7641
pISSN - 1439-4235
DOI - 10.1002/cphc.200300776
Subject(s) - perylene , anthracene , pyrene , phenanthrene , chemistry , jet (fluid) , analytical chemistry (journal) , matrix isolation , infrared spectroscopy , spectroscopy , absorption (acoustics) , infrared , absorption spectroscopy , naphthalene , argon , photochemistry , materials science , molecule , optics , organic chemistry , physics , quantum mechanics , composite material , thermodynamics
Infrared absorption spectra of the CH stretching region were observed for naphthalene, anthracene, phenanthrene, pyrene, and perylene using a heated, supersonic, slit‐jet source and cavity ringdown spectroscopy. Band positions and intensities recorded with 0.2‐cm −1 resolution were compared with previous gas‐phase and argon matrix isolation experiments, as well as theoretical calculations. The largest matrix shift in the absorption maximum (‐7.4 cm −1 ) was observed for anthracene, with all others shifted by 3.0 cm −1 or less. Spectral features in the supersonic jet spectrum were generally narrower than those observed in the Ar matrix, with the largest matrix broadening found for the perylene (80 % increase). Low number densities observed for the larger polycyclic aromatic hydrocarbons (PAHs) suggest that the lower vapor pressure of PAHs with catacondensed four‐membered rings and with five‐membered rings other than perylene will not be detectable using our current configuration.