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
The influence of local phonons on spin-lattice relaxation in photo-excited triplet states
β Scribed by P.J.F. Verbeek; C.A. van't Hof; J. Schmidt
- Publisher
- Elsevier Science
- Year
- 1977
- Tongue
- English
- Weight
- 299 KB
- Volume
- 51
- Category
- Article
- ISSN
- 0009-2614
No coin nor oath required. For personal study only.
π SIMILAR VOLUMES
## 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
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.
The pulse recovery method is applied to the triplet states of naphthalene, quinoxalene, and tetramethylpyrazine 03iP) in durene and biphenyi host crystals for 1.25% d Td 4.23%. Temperature dependen~es of the spin-lattice relaxation rates are characteristic of Raman and direct processes.
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.
Spin-lattice relaxation rates in the Tt triplet state of 9,lOanthraquinone dissolved in n-heptane and isooctane are measured in the temperature region 1.9 to 30 K using an excitation of phosphorescence by short flashes. The relaxation rates are determined from the tri-evponential decay curves measur