Collisional deactivation of highly vibrationally excited benzene pumped at 248 nm
| Autor: | John R. Barker, Murthy L. Yerram, Keith D. King, Jerrell D. Brenner |
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| Rok vydání: | 1990 |
| Předmět: | |
| Zdroj: | The Journal of Physical Chemistry. 94:6341-6350 |
| ISSN: | 1541-5740 0022-3654 |
| Popis: | Highly vibrationally excited gas-phase benzene was prepared with a pulsed excimer laser operating at 248 nm, and the subsequent collisional deactivation was monitored with time-resolved infrared fluorescence (IRF) from the C-H stretch modes near 3,050 cm{sup {minus}1}. Very low pressure photolysis mass spectrometric experiments were carried out to determine whether reaction of the benzene occurs at this laser wavelength and can complicate the energy-transfer investigation. The quantum yield for benzene loss was determined to be 3 {plus minus} 1%, consistent with previous experiments (Nakashima, N.; Yoshihara, K. J. Chem. Phys. 1982, 77, 6040) that found photoproducts as the result of multiphoton excitation. The only detectable gas-phase product was H{sub 2}, which had a quantum yield of 0.8 {plus minus} 0.3%. Energy-transfer data were obtained for 19 collider gases, including unexcited benzene. The inversion technique for converting the observed IRF decay to , the bulk average energy, was examined in detail, and a careful propagation of errors analysis performed. |
| Databáze: | OpenAIRE |
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