| Numéro |
J. Phys. Colloques
Volume 46, Numéro C7, Octobre 1985
Fifth International Conference on Dynamical Processes in the Excited States of Solids / Dynamique des Etats Excités dans les Solides
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|---|---|---|
| Page(s) | C7-377 - C7-380 | |
| DOI | https://doi.org/10.1051/jphyscol:1985767 | |
Fifth International Conference on Dynamical Processes in the Excited States of Solids / Dynamique des Etats Excités dans les Solides
J. Phys. Colloques 46 (1985) C7-377-C7-380
DOI: 10.1051/jphyscol:1985767
Physics Inst., Klingelbergstr. 82, CH-4056 Basel, Switzerland
J. Phys. Colloques 46 (1985) C7-377-C7-380
DOI: 10.1051/jphyscol:1985767
QUANTUM BEATS IN THE FLUORESCENCE DECAY OF TETRACENE CRYSTALS
J. FünfschillingPhysics Inst., Klingelbergstr. 82, CH-4056 Basel, Switzerland
Abstract
We have measured the fluorescence decay of tetracene crystals excited with ps-pulses of a dye laser with a time resolution of about 100 ps over 5 decades of the signal intensity. After some 200 ps after the excitation, the observed strongly nonexponential decay is mainly due to geminate recombination of triplet excitons that have been created by fission processes. The decay thus reflects the dynamics of the triplet motion. Superimposed are magnetic field dependent quantum beats that reflect the spin evolution of the triplet pairs. A quasi twodimensional random walk computersimulation yields a very good fit to the data. The resulting triplet hopping rates are smaller than the currently accepted values.