Rate constants of singlet exciton fission in a tetracene crystal determined from the rydmr spectral linewidth
✍ Scribed by E.L. Frankevich; V.I. Lesin; A.I. Pristupa
- Publisher
- Elsevier Science
- Year
- 1978
- Tongue
- English
- Weight
- 410 KB
- Volume
- 58
- Category
- Article
- ISSN
- 0009-2614
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✦ Synopsis
The. lifetime T of a correlated pair of triplet excitons has been determined from the linewidth of the RYDMR spectrum. Tbe value r = 7 X lO+ s obtained has been used to cak&te the rate constants of the singlet exciton fsion into a pair of triplet excitons in a tetracene single crystal. The fission was shown to go via three steps: the fast one is contact pair formation, the second step is its tramformation into a diffusive pair, and the third one is the dissociation of the diffusive pair into free triplet excitors. Both the values of the rate constants of every step and the entropy growth in the transition from contact pair to diffusive pair have been evaluated.