The effect of vibronic relaxation on the spin coherence in photo-excited triplet states
β Scribed by C.A. van 't Hof; J. Schmidt
- Publisher
- Elsevier Science
- Year
- 1975
- Tongue
- English
- Weight
- 444 KB
- Volume
- 36
- Category
- Article
- ISSN
- 0009-2614
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β¦ Synopsis
Rcceivcd 21 Jl?ly 1975
We present a theoretical model for describing spin coherence in photoexcited triplet states in zero-field under the influence of vibronic relaxation. From a comparison with experimental results in parabenzoquinone we obtain information about the properties of the excited vibronic level.
π SIMILAR VOLUMES
We have observed a temperature dependence of the direction of the principal axes of the zero-field splitting for the triplet state of naphthalene in durene. The effect is caused by thermal excitation to a nearby local phonon state, where the spin itYes are rotated with respect to those in the lowest
We have measured the temperature dependence of the spin coherence and the resonance frequencies of a triplet state under the influence of vlbronic relaxation. We derive the hfetime and zero-field splitting parameters of the excited vibromc level.
The kinetic parameters of the photo-excited triplet state of pentacene in p-terphenyl crystals have been calculated from the electron spin echo (ESE) decay curves in the temperature range of 5-300 K. The results suggest the calculated decay parameters depend strongly on guest deuteration, especially
for the triplet state of quinosdinc in durene and in pcrdeuterated naphthalene (Na'a) with the pulse uturation method. In the N-da host crystai rhe anisotropy is identical for both molecular orientations A and B.
Ternpernture dependent ESR relaxation measurements made on the excited triplet state of pyrene-d-10 show ;L decrease in Tie with decrease in temperature from 300Β°K to SOOK. Optical measurements suggest the relnxation arises from exciton motion in the host crystal fluorene.