Spin-spin and spin-lattice relaxation in the triplet state of<i>AB</i>-pairs in isotopically mixed crystals of naphthalene

Kooten, J.F.C. van; Schmidt, Jan

doi:10.1080/00268978500101381

Cited by 7 publications

(1 citation statement)

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“…In photo-excited triplet states, the transfer of the electron spin polarization to the nuclear spin system takes place in the order of a few hundred ns (Schmidt et aI., 1992), and the spinspin relaxation is dominated by a fast spin-lattice relaxation induced by a thermally-activated exchange process (van Kooten and Schmidt, 1985). "Peculiar spin dynamics" were observed in the photoexcited triplet state of pentacene in benzoic acid crystal (Ong et aI., 1994).…”

Section: Tripletsmentioning

confidence: 96%

Relaxation Times of Organic Radicals and Transition Metal Ions

Eaton

2002

Biological Magnetic Resonance

155

165

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Abstract:Review of electron spin relaxation times for organic radicals and transition metal ions in magnetically dilute samples. Emphasis is placed on studies that have been performed as a function of temperature and that provide insight into the relaxation processes. INTRODUCTION Scope of this ChapterMost of the methods for determining distances between spins (ch.l) are either experimentally feasible or theoretically applicable for a limited range of electron spin relaxation times. For example, analysis of the dipolar contribution to the CW line shape to determine interspin distance requires that the relaxation rate for the interacting partner is slow enough that the dipolar splitting is not collapsed by electron spin relaxation. In addition, analysis of the line shapes assumes that spectra are obtained under nonsaturating conditions and are free from passage effects. Application of methods based on changes in relaxation times requires that the relaxation rate of the interacting partner fall within certain limits. The longest distance that can be obtained by pulsed techniques is limited, in principle, by the relaxation-determined width of an individual spin packet. Thus, knowledge of electron spin relaxation times is foundational to the methodologies presented in this book.

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Section: Tripletsmentioning

confidence: 96%