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• W2024371036 abstract "Resolved fluorescence spectra from low pressures of benzene with nine added gases have been used to follow mode-to-mode vibrational relaxation in the S1 state of benzene under “single-collision” conditions. Cw pumping of the S1 fundamental 61 (ν″6 = 522 cm−1) allows study of collisional vibrational energy flow into each of four channels. Two channels consist of flow into single levels, and the others represent flow into unresolved pairs of levels. The mode-to-mode cross sections are much larger than those usually observed in ground electronic states, being near gas kinetic even for partners transferring energy by VT, R processes alone. The mode-to-mode transfer has highly specific patterns, with roughly seventy percent of the transfer going into the four channels in spite of many other nearby levels. The largest cross sections are always to a level 237 cm−1 above the initial level rather than to a level nearly resonant (ΔE = 7 cm−1) with the initia l level. A common pattern of flow occurs for the four gases transferring energy by VT, R processes alone, and another common pattern is established for the five gases which can also use VV transfers. With the exception of one channel, VV resonances with vibrationally complex partners increase cross sections by less than a factor of two over that provided by the VT, R path. VV transfers have a similarly small effect on the overall vibrational relaxation rate out of the initial level 61. Both the flow patterns and the VV versus VT, R competitions are accounted for with an extremely simple and general set of propensity rules taken directly from SSH calculations made by others for vibrational relaxation in ground electronic states. The rules are based on the degeneracies of the final levels, the number of vibrational quantum changes, and the amount of energy exchanged between vibrational and translational/rotational degrees of freedom. The rules seem general to relaxation in both ground and excited electronic states, whereas large cross sections seem a special property of the excited state. The cross sections for collision partners SF6 and perfluorohexane are small relative to those for other partners with similar vibrational complexity and mass." @default.
• W2024371036 created "2016-06-24" @default.
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• W2024371036 date "1978-01-01" @default.
• W2024371036 modified "2023-09-23" @default.
• W2024371036 title "Mode-to-mode vibrational energy flow in S1 benzene" @default.
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• W2024371036 doi "https://doi.org/10.1016/0301-0104(78)85168-4" @default.
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