| Autor: |
Bevilacqua, Thomas J., Andrews, B. Kim, Stout, Joe E., Weisman, R. Bruce |
| Předmět: |
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| Zdroj: |
Journal of Chemical Physics; 4/1/1990, Vol. 92 Issue 7, p4627, 2p |
| Abstrakt: |
Collisional vibrational relaxation of T1 pyrazine by He and SF6 has been measured for excess vibrational energies ranging from 2500 to 5400 cm-1. Energized pyrazine vapor is formed through intersystem crossing from the optically prepared 8a1 level of S1. Triplet–triplet transient absorption is then used to monitor the T1 decay kinetics under various collisional conditions. Based on the known variation of T1 pyrazine’s nonradiative decay rate with vibrational energy, the vibrational energy content is obtained as a function of collisional history. The results show a factor of ten increase in average energy lost per gas kinetic collision as the vibrational energy content of the pyrazine increases from ∼2500 cm-1 to 5000 cm-1. The energy loss per collision seems relatively constant above 5000 cm-1. This dependence is more complex than had been found from studies of other polyatomics at higher energies. It also appears that vibrational energy loss from electronically excited organic molecules at high vibrational energies may be similar to that from ground state species. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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