The collisional deactivation of vibrationally excited pyrazine (C4N2H4) in the electronic ground state by 19 collider gases was studied using the time‐resolved infrared fluorescence (IRF) technique. The pyrazine was photoexcited with a 308 nm laser and its vibrational deactivation was monitored following rapid radiationless transitions to produce vibrationally excited molecules in the electronic ground state. The IRF data were analyzed by a simple approximate inversion method, as well as with full collisional master equation simulations. The average energies transferred in deactivating collisions (〈ΔE〉d) exhibit a near‐linear dependence on vibrational energy at lower energies and less dependence at higher energies. The deactivation of ground state pyrazine was found to be similar to that of ground state benzene [J. R. Barker and B. M. Toselli, Int. Rev. Phys. Chem. 12, 305 (1990)], but it is strikingly different from the deactivation of triplet state pyrazine [T. J. Bevilacqua and R. B. Weisman, J. Chem. Phys. 98, 6316 (1993)].
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22 July 1996
Research Article|
July 22 1996
Collisional deactivation of highly vibrationally excited pyrazine
Laurie A. Miller;
Laurie A. Miller
Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109‐2143
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John R. Barker
John R. Barker
Department of Chemistry and Department of Atmospheric, Oceanic, and Space Sciences, University of Michigan, Ann Arbor, Michigan 48109‐2143
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J. Chem. Phys. 105, 1383–1391 (1996)
Article history
Received:
March 18 1996
Accepted:
April 18 1996
Citation
Laurie A. Miller, John R. Barker; Collisional deactivation of highly vibrationally excited pyrazine. J. Chem. Phys. 22 July 1996; 105 (4): 1383–1391. https://doi.org/10.1063/1.471996
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