Collisional transfer of vibrational energy in vapors of polyatomic molecules

Zalesskaya, G. A.; Yakovlev, D. L.

doi:10.1007/bf02606681

Cited by 1 publication

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“…The increase ofdecay rates ofthe fast component with a pressure growth is determined by the rise of vibrational (V-V, relaxation rates. These conclusions are supported by the pressure dependencies of the integrated intensity of the long decay (12) and the short one (I,). The results clearly demonstrate that the collisional mechanism can populate the long-lived states.…”

Section: Discussionsupporting

confidence: 50%

<title>Collisional relaxation of vibrationally excited complex molecules following laser excitation: effect of supercollisions</title>

Zalesskaya¹,

Yakovlev²,

Sambor³

et al. 1999

SPIE Proceedings

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Intensities and decay rates of delayed luminescence (DL) initiated by a pulse ofN2 laser or CO2 laser were employed to probe collisional relaxation of complex molecules (benzophenone -C33H100, acetophenone -C8H80, antraquinone -C14H802) diluted with bath gases: Ar, C2H4, SF6, C5H12, CC!4. It was shown that time resolution about 108 sec permit one to divide the V-V and V-T processes for such large and complex molecules, the relaxation occurs in two stages. Upper levels relax through V-V transfer, which completes after several collisions. The collisional efficiencies of V-V process had the values typical for supercollision. The average energies transferred per collision, (zlE), well correlate with predictions of the simplc ergodic collision theory of intermolecular energy transfer.The majority of energy transfer collisions involve V-T/R transfer of relatively small energies. The CO2 laser excitation method to initiate the DL allowed to obtain only V-T CET quantities because oflower time resolution.

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Section: Discussionsupporting

confidence: 50%