Fate of excited states in jet-cooled aromatic molecules: bifurcating pathways and very long lived species from the S1 excitation of phenylacetylene and benzonitrile

The Journal of Physical Chemistry. a
Jason HofsteinP M Johnson

Abstract

Pump-probe delayed ionization studies on phenylacetylene and benzonitrile in a supersonic beam reveal the production of a low-ionization-potential (approximately 5.7 eV) species lasting more than hundreds of microseconds after excitation to the S1 state. Excitation of the molecules was done with a frequency-doubled, Fourier transform-limited, pulse-amplified cw laser, and the rotationally resolved structure of the S1-S0 transition ensures that the excited molecules are monomers. Excited-state photoelectron spectroscopy shows that the long-lived species are formed during the light pulse but not by transfer from the fluorescing S1 population after the pulse, even though the S1 spectral signature is present in the long-lived action spectrum. This behavior differs greatly from that found in benzene and with most commonly held pictures of radiationless transitions in large molecules.

References

Aug 22, 1994·Physical Review Letters·D DingR E Haufler

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Citations

Mar 5, 2016·The Journal of Chemical Physics·Yuzhu LiuGregor Knopp
Aug 1, 2013·The Journal of Physical Chemistry. a·Philip M Johnson, Trevor J Sears
May 28, 2020·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Sohidul Islam MondalG Naresh Patwari
Apr 10, 2020·The Journal of Chemical Physics·Philip M Johnson

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