Reindl, S. and Penzkofer, Alfons (1998) Higher excited-state photoisomerization and singlet to triplet intersystem-crossing in DODCI. CHEMICAL PHYSICS, 230 (1). pp. 83-96. ISSN 0301-0104, 1873-4421
Full text not available from this repository.Abstract
An intensity dependent N-isomer fluorescence reduction was observed by picosecond laser pump and probe experiments for DODCI (3,3'-diethyloxadicarbocyanine iodide) in ethylene glycol and methanol. The S-1-S-0 fluorescence signal caused by time-delayed probe pulse excitation is reduced due to pump pulse induced enhanced N --> P photoisomerisation, higher excited-stare photodisintegration, and S-m-T-m' intersystem-crossing. The transmission of a time-delayed picosecond probe light continuum is lowered by enlarged P-isomer absorption and triplet-triplet absorption. The excited-state absorption dynamics, photoisomerisation, photodisintegration and intersystem-crossing dynamics are simulated numerically. The quantum yields of P-isomer formation caused by higher excited-state singlet absorption are phi'(NP) = 0.06 +/- 0.02 and 0.1 +/- 0.02 for DODCI in ethylene glycol and methanol, respectively. S-m-T-m' quantum yields of tripler formation of phi(SmTm') = 0.05 +/- 0.02 for DODCI in ethylene glycol and phi(SmTm') = 0.04 +/- 0.02 for DODCI in methanol are determined. Triplet-triplet absorption cross-section spectra ale deduced from the picosecond light continuum transmission measurements. (C) 1998 Elsevier Science B.V.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | ENERGY-TRANSFER; 2-PHOTON EXCITATION; P-ISOMERS; FLUORESCENCE; LASER; DYES; PHOTOPHYSICS; ANTHRACENES; RELAXATION; PULSES |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Experimental and Applied Physics > Alumni or Retired Professors > Group Alfons Penzkofer |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 24 Feb 2023 10:54 |
| Last Modified: | 24 Feb 2023 10:54 |
| URI: | https://pred.uni-regensburg.de/id/eprint/49898 |
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