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1999 | 95 | 6 | 897-910
Article title

Luminescent Probe for Highly Energetic Collisions in Mixtures of Complex Molecules with Acceptors of Vibrational and Triplet Energy

Content
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Languages of publication
EN
Abstracts
EN
Pressure dependences of intensities and decay rates of time-resolved luminescence of acetophenone, benzophenone, anthraquinone were used to obtain the efficiencies of vibrational and triplet-triplet energy transfer. It was shown that vibrational relaxation of the chosen molecules can be interpreted in terms of two consecutive processes: rapid collisional relaxation of molecules from initially prepared states to a vibrational distribution at T_{vib} by vibration-vibration process and relaxation of this vibrational distribution to the thermal one (vibration-translation process). At relatively small internal energy < 10000 cm^{-1}, the collisional efficiencies of the vibration-vibration process in mixtures with polyatomic bath gases had values typical of processes with a supercollision contribution. Molecules relaxed from the upper vibrational level to the vibrational distribution after several collisions (2-3). The average energies transferred per collision are well correlated with predictions of the simple ergodic theory of collisional energy transfer. The majority of the collisions took part only in vibration-translation energy transfer of relatively small energies. The efficiencies of triplet-triplet energy transfer were analyzed for acetophenone, benzophenone and anthraquinone as donors and biacetyl-acceptor in a gas phase when energy of about 20000 cm^{-1} was transferred. It permitted us to elucidate the common features of highly energetic collisions. It was shown that the efficiencies are much lower than the gas kinetic ones and depended on the vibrational energy and temperature. It was discussed how to enhance triplet-triplet efficiencies due to vibrational excitation of a donor molecule.
Keywords
EN
Publisher

Year
Volume
95
Issue
6
Pages
897-910
Physical description
Dates
published
1999-06
received
1998-07-23
(unknown)
1999-02-01
Contributors
author
  • Institute of Molecular and Atomic Physics of the National Academy of Sciences, 70, Skariny Av., Minsk, Belarus, 220071
author
  • Institute of Molecular and Atomic Physics of the National Academy of Sciences, 70, Skariny Av., Minsk, Belarus, 220071
author
  • Institute of Molecular and Atomic Physics of the National Academy of Sciences, 70, Skariny Av., Minsk, Belarus, 220071
author
  • Institute of Molecular and Atomic Physics of the National Academy of Sciences, 70, Skariny Av., Minsk, Belarus, 220071
References
Document Type
Publication order reference
Identifiers
YADDA identifier
bwmeta1.element.bwnjournal-article-appv95z603kz
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