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.
Variation in the spin-lattice relaxation rate of the photoexcited triplet state of pyrene-d10
β Scribed by D. Inan
- Publisher
- Elsevier Science
- Year
- 1980
- Tongue
- English
- Weight
- 315 KB
- Volume
- 76
- Category
- Article
- ISSN
- 0009-2614
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β¦ Synopsis
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 CO large moduiatlons of the dlpolar couplmg remor The vanarmn wth remperarure of the relaxarmn rate along the x and = axes are different
π SIMILAR VOLUMES
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.
## Electron spin polarization in the photoescitrd triplet state of tetraphenyl porphyrin was detected at 100Β°K using EPR technique. The zero Iield splitting parameters IDland IEI for the free base porphyrin were found to be 0.0369 ? 0.0005 and 0.0082 ? 0.0005 WI-'. respectively. ## Detection o
The temperature dependence of the individual spin-lattice relasation rate constants (Ii',) between the lowest triplet sublevels of naphthalene-lrs in B polyqstalline Shpol'skii matrix of n-pentane have been measured between I.?, and 1.4 Ii in zero field. The toral sublevel decay constants are evalua