Luminescent Probe for Highly Energetic Collisions in Mixtures of Complex Molecules with Acceptors of Vibrational and Triplet Energy
| العنوان: | Luminescent Probe for Highly Energetic Collisions in Mixtures of Complex Molecules with Acceptors of Vibrational and Triplet Energy |
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| المؤلفون: | E. G. Sambor, G. A. Zalesskaya, D. I. Baranovsky, D. L. Yakovlev |
| المصدر: | Acta Physica Polonica A. 95:897-910 |
| بيانات النشر: | Institute of Physics, Polish Academy of Sciences, 1999. |
| سنة النشر: | 1999 |
| مصطلحات موضوعية: | Materials science, Polyatomic ion, Relaxation (NMR), General Physics and Astronomy, Kinetic energy, chemistry.chemical_compound, chemistry, Physics::Atomic and Molecular Clusters, Vibrational energy relaxation, Benzophenone, Molecule, Physics::Chemical Physics, Atomic physics, Luminescence, Excitation |
| الوصف: | 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 Tvib by vibration—vibration process and relaxation of this vibrational distribution to the thermal one (vibration—translation process). At relatively small internal eneigy < 10000 cm —", 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' 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. PACS numbers: 31.50.+w, 34.50.Ez, 34.90. + q |
| تدمد: | 1898-794X 0587-4246 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_________::0f5c761ec0647d040e26b7add2a38a4e https://doi.org/10.12693/aphyspola.95.897 |
| حقوق: | OPEN |
| رقم الأكسشن: | edsair.doi...........0f5c761ec0647d040e26b7add2a38a4e |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 1898794X 05874246 |
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