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Scientific paper
Jun 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010mss..confemg16l&link_type=abstract
"International Symposium On Molecular Spectroscopy, 65th Meeting, Held 21-25 June, 2010 at Ohio State University. http://molspec
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Electronic (Uv/Vis/Nir)
Scientific paper
Pump-probe photoionization experiments on the origin of the S_1 ← S_0 transition of phenylacetylene (PA) have revealed the production of long lived (≫ 100 μ sec lifetime) species with low ionization potential where short lifetimes (nsec lifetime) are expected if simple intersystem crossing takes place. The pump-probe delay photoionization decay curve for the band origin, previously presented by Hofstein et al.,a and four other assigned strong bands in the S_1 ← S_0 transition of PA have been obtained in recent experiments. Following S_1 ← S_0 excitation, the decay consists of a prompt short-lived component matching the measured singlet fluorescence lifetime and a second, very long-lived, component. The ratios between the singlet channel signal to that of the long-lived species for these bands are not the same: 3.03±0.38, 1.48±0.33, 1.75±0.19, 3.11±0.36 and 2.77±0.35 for the origin, ν15, ν6a, βcc and ν_1, respectively. The fact that the ν15 and ν6a modes have low ratios suggests that the normal coordinates of these modes could lie near the reaction path for the formation of the long lived species. Thus, these results combined with theoretical calculations may potentially give an indication of the identity of the long-lived species. 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.
J. Hofstein, H. Xu, T. J. Sears and P. M. Johnson, J. Phys. Chem. A 112, 1195-1201 (1999)
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Chang Chih-Hsuan
Johnson Philip M.
Lopez Gary V.
Sears Trevor J.
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