Gratz, H. and Penzkofer, Alfons (2001) Saturable absorption dynamics in the triplet system and triplet excitation induced singlet fluorescence of some organic molecules. CHEMICAL PHYSICS, 263 (2-3). pp. 471-490. ISSN 0301-0104
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The triplet saturable absorption behaviour of the xanthene dyes eosin Y. erythrosin B- and rose bengal and of the fullerene molecule C-70 is studied. The molecules are excited to the SI-state by intense picosecond pulses (wavelength lambda (P) = 527 nm). They relax dominantly to the triplet system by intersystem crossing. The triplet-triplet saturable absorption is investigated with time-delayed intense picosecond pulses (wavelength lambda (L) = 1054 nm) in the transparency region of the molecules in the singlet ground state. Higher excited-state triplet absorption cross-sections and higher excited-state triplet relaxation times are determined by numerical simulation of the experimental results. Time-resolved fluorescence measurements reveal higher excited-state triplet to singlet back-intersystem-crossing and multi-step tripler photoionization. Additionally the two-photon absorption cross-sections at lambda (L) = 1054 nm are determined by measurement of the fundamental pulse two-photon induced fluorescence relative to the second-harmonic pulse single-photon induced fluorescence. (C) 2001 Elsevier Science B.V. All rights reserved.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | EXCITED-STATE ABSORPTION; PICOSECOND LIGHT-PULSES; LASER EXCITATION; EOSIN-Y; PHOTOPHYSICAL PROPERTIES; DYE SOLUTIONS; MODE-LOCKING; C-70; C-60; SPECTROSCOPY; triplet saturable absorption; triplet-singlet intersystem crossing; triplet-singlet intersystem absorption; triplet photoionization; two-photon absorption; eosin Y; erythrosin B; rose bengal; fullerene molecule C-70 |
| 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: | 15 Feb 2022 14:10 |
| Last Modified: | 15 Feb 2022 14:10 |
| URI: | https://pred.uni-regensburg.de/id/eprint/41805 |
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