After electronic excitation most organic molecules return to the electronic ground state via radiationless processes. Internal conversion is one of the most important relaxation mechanisms. Usually, internal conversion rates are investigated by time-resolved bleaching experiments where the absorptio
Picosecond spectroscopic investigation of the internal conversion rate of excited perylene in solution
โ Scribed by C. Rulliere; A. Declemy; Ph. Kottis
- Publisher
- Elsevier Science
- Year
- 1984
- Tongue
- English
- Weight
- 676 KB
- Volume
- 110
- Category
- Article
- ISSN
- 0009-2614
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โฆ Synopsis
l'he dynamics ot relaxation from upper vibrational levels of the ST state and from the upper vibronic states S: and .S: of per) Icnc dis';olvcd m orgmc solvents of vGz~us vlscositles and pohities have been invcstipnted. Uneqxcted slow dewy times hvc been me,wwd. of 11~ order of 30 ps for vibrational rchation in the ST rwnifold and of tlw order of 50-60 ps for mrcmal cooverwn from state% S; and S:. Signi!icant solvent effects hve not been observed on &an&~ the pal&y +tnd the \zscosity of the sohenr.
๐ SIMILAR VOLUMES
The lluorescencc fiferimes and quantum yields of the S2 state of xantbionc in benzene and isoloctanc sotution at room temperature have been mcnsurcd. The Sz iifctimn wcrc found to bc I8 2 2 ps in bcnzcnc and 43 % 'I! ps in iso-ocrane. The non-radiative decay rate constant is 5.6 x lO'\* s-l in benz