PENZKOFER, A and BEIDOUN, A (1993) TRIPLET-TRIPLET ABSORPTION OF EOSIN-Y IN METHANOL DETERMINED BY NANOSECOND EXCIMER-LASER EXCITATION AND PICOSECOND LIGHT CONTINUUM PROBING. CHEMICAL PHYSICS, 177 (1). pp. 203-216. ISSN 0301-0104,
Full text not available from this repository.Abstract
The absolute triplet-triplet absorption cross-section spectrum sigma(T)(lambda) of eosin Y in methanol at room temperature is determined in the wavelength region from 400 to 1000 nm and at 308 and 1054 nm. The triplet state is populated by XeCl excimer laser excitation to a singlet state and subsequent intersystem crossing. The triplet level population is determined by numerical simulation of the pump pulse absorption dynamics. The triplet-triplet absorption is probed with picosecond spectral light continua which are generated in a D2O sample by a synchronized mode-locked Nd: glass laser. The decay of the triplet level population is studied by delayed picosecond light continua probing. Second order rate constants of k(ox)(1) - 1.1 X 10(9) dm3 mol-1 s-1 for oxygen quenching, k(TT)(1) = 1.3 x 10(9) dM3 mol-1 s-1 for triplet-triplet annihilation, and k(TS)(1) = 4 x 10(8) dm3 mol-1 s-1 for triplet-singlet concentration quenching have been determined.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | OPTICAL-PHASE CONJUGATION; BORIC-ACID GLASS; FLASH-PHOTOLYSIS; EXTINCTION COEFFICIENTS; ROSE-BENGAL; THEORETICAL-ANALYSIS; ORGANIC-MOLECULES; CONDENSED PHASES; DYES; STATE; |
| Depositing User: | Dr. Gernot Deinzer |
| Last Modified: | 19 Oct 2022 08:42 |
| URI: | https://pred.uni-regensburg.de/id/eprint/53686 |
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