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Spin—lattice relaxation in a guest triplet state is induced by proton tunneling in a benzoic acid host crystal

✍ Scribed by D. Chaudhuri; B.D. Schlyer; A.H. Maki

Publisher: Elsevier Science
Year: 1991
Tongue: English
Weight: 479 KB
Volume: 178
Category: Article
ISSN: 0009-2614
DOI: 10.1016/0009-2614(91)85059-6

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✦ Synopsis

Spin-lattice relaxation (SLR) of the triplet state of pentacene-6,13quinone (PQ) in n-C1,H2,, and as a guest impurity in benzoic acid, BA-h, and the acid deuterated host, BA-d,, has been measured at temperatures near 4 K. Enhanced SLR in the BA hosts relative to n-C, ,Hz4 is a thermally activated process which we attribute to a phonon-assisted tunneling transition between local BA tautomer states.

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The phosphorescent triplet state of aniline in a p-xylene host crystal: a study of spin-spin and spin-lattice relaxation

✍ H.M. van Noort; C.A. van't Hof; B. Wirnitzer; J. Schmidt 📂 Article 📅 1981 🏛 Elsevier Science 🌐 English ⚖ 667 KB

It is shown that the spm-spin and spin-lattice relaxation rates in the lowest triplet state of aniline in a p-xylene host crystal are determmed by the presence of a close-lying local phonon state. It is concluded that the motion of the aniline molecule has a highly localised character.