The orlentatlon and temperature dependence of the spm-lattwze relauatlon rate m the photoevnted tnplet sfafe of pyrene-d,,, m a Ruorene cr)istaI was measured usrng the Saturalmn method The onenfafmn dependence supports the hypothesis rhat the relaxarlon arises from strong amsotropx hbratlons coupled
The anisotropy of the spin-lattice relaxation rate in the excited triplet state of quinoxaline
β Scribed by U. Konzelmann; M. Schwoerer
- Publisher
- Elsevier Science
- Year
- 1973
- Tongue
- English
- Weight
- 317 KB
- Volume
- 18
- Category
- Article
- ISSN
- 0009-2614
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β¦ Synopsis
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.
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 spin-lattice relaxation rates in the phosphorescent triplet state To of naphthalene in durene as a function of the &e&on of the magnetic field-The orientational dependence of the reIaxation is explained by thermal activation to a close Iying local phonon state where the spin axe
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
## 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