STUDY OF PHENYLACETYLENE BY CAVITY RING-DOWN SPECTROSCOPY
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Date
2011
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Publisher
Ohio State University
Abstract
Cavity ring-down (CRD) measurements have been made on the $S_1 (\tilde{A} \ ^{1}B_{2}) \leftarrow S_0 (\tilde{X} \ ^{1}A_{1})$ absorption spectrum of slit jet-cooled phenylacetylene (PA) in the 279 nm region as a further investigation of the photophysical properties of PA reported by Hosftein et al., 1195 (2008)} The intensities in the new CRD data are compared with those obtained in the old REMPI experiments, and computational models., 8262 (2010)} The results show that the strong bands in the REMPI spectrum are attenuated while the weak bands ($a_1$ modes) remained the same when compared to CRD spectra. The comparison of the simulated spectrum to the CRD and REMPI spectra were satisfactory for most part when the $a_1$ modes were scaled up by a factor of 3.24 and 3.55, respectively, giving evidence of some possible theoretical artifacts.$^{c}$ The temperature of the slit jet-cooled PA was found to be in the range of $30\pm5$K by comparison with simulations of the rotational structure of the band origin of the $S_1 \leftarrow S_0$ transition. Additionally, many hot bands located near the band origin of the this transition have been assigned.
Description
Acknowledgments: Work at Brookhaven National Laboratory was carried out under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy and supported by its Office of Basic Energy Sciences, Division of Chemical Sciences, Geosciences and Biosciences.
Author Institution: Department of Chemistry, Stony Brook University, Stony Brook, New York 11794; Department of Chemistry, Brookhaven National Laboratory, Upton, New York 11973
Author Institution: Department of Chemistry, Stony Brook University, Stony Brook, New York 11794; Department of Chemistry, Brookhaven National Laboratory, Upton, New York 11973