| Autor: |
N. A. Vidmont, V. Kh. Brikenstein, V.A. Benderskii, Ye. Ya. Misochko, V. V. Korshunov |
| Rok vydání: |
1980 |
| Předmět: |
|
| Zdroj: |
Molecular Crystals and Liquid Crystals. 57:47-64 |
| ISSN: |
0026-8941 |
| DOI: |
10.1080/00268948008069818 |
| Popis: |
Various nonlinear phenomena observed in molecular crystals under intensive optical pumping (nonlinear fluorescence quenching, stimulated emission. pulsed heating and propagation of phonons) have been considered. Changes in anthracene crystals fluorescence spectra have been studied for pulse pumping intensities of 1020-−5 1022 cm−2 s−1. Additional broadening of exciton bands occurs at intensities exceeding a certain initial level and has unusual kinetics: slow growth (broadening maximum is observed at a drop of the pumping pulse) and a considerably rapid drop (in the range of 1–3 ns). When the front of the crystal is illuminated with a probing pulse of low intensity emitted after finishing of the pumping pulse, a sharp threshold broadening of the bands is observed with the growth of the probing pulse, the probing pulse causing the broadening without practically heating the crystal. A reversible formation of defects under the action of intense UV pumping has been found. It is concluded that the obs... |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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