Thermalization after photoexcitation to the S2 state of trans-azobenzene in solution

Autor:	Shinji Yamaguchi, Masahide Terazima, M. Takezaki, Noboru Hirota
Rok vydání:	1998
Předmět:	business.industry Chemistry General Physics and Astronomy Grating Solvent Photoexcitation chemistry.chemical_compound Thermalisation Azobenzene Excited state Physical and Theoretical Chemistry Atomic physics business Acetonitrile Thermal energy
Zdroj:	The Journal of Chemical Physics. 109:603-609
ISSN:	1089-7690 0021-9606
DOI:	10.1063/1.476597
Popis:	A simple method to measure a rate of the translational temperature increase after the nonradiative transition with a few ps time resolution is presented. This method uses an acoustic peak shift of the transient grating signal, which can be determined accurately, and is very sensitive to rates and the relative amount of the thermal energy from the nonradiative transition. Using this method, the thermalization rate after the photoexcitation of trans-azobenzene to the S2(ππ*) state is measured. The acoustic peak shift indicates that the temperature of the solvents rises within less than ∼3 ps after the nonradiative transition of the S2→S1 process. The thermalization after the S1→S0 transition completes faster than the decay of the S1 state (16 ps in acetonitrile and 18 ps in ethanol). The fast energy transfer from the solute to the solvent is discussed.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::d8d290f0002d032ee22430e9bda7c672 https://doi.org/10.1063/1.476597 Zobrazit plný text záznamu