Spin-orbit coupling,spin-lattice relaxation,and spin-memory studies ofF-center-molecular-ion pairs in alkali halides |
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Authors: | G Baldacchini S Botti U M Grassano F Luty |
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Institution: | (1) Area INN, Dipartimento Sviluppo Tecnologie di Punta, CRE Frascati, ENEA, P.O. Box 65, 00044 Frascati (Roma), Italia;(2) Dipartimento di Fisica dell'Università di Roma, Tor Vergata, Italia;(3) Physics Department, University of Utah, 84112 Salt Lake City, UT, USA |
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Abstract: | Summary The spin-orbit parameter Δ, spin-lattice relaxation timeT
1, and spin-mixing parameter ɛ ofF
H(OH−) andF
H(CN−) centers in several alkali halides have been studied with magnetic circular dichroism at ∼2 K. A close comparison of the
experimental results before and after optically induced association of theF center with the molecular ion has been made. In crystals of NaCl structure the negative spin-orbit parameter Δ changes little
betweenF andF
H centers in the same host. For CsCl and CsBr two values of Δ have been derived forF
H(CN−) centers with axis parallel or perpendicular to the magnetic field. In all studied systems, the spin-lattice relaxation timeT
1 is already shorter before aggregation compared toF formation. The spin-mixing parameter ɛ decreases slightly forF
H(OH−) compared toF centers, while it increases drastically forF
H(CN−) defects and reaches its maximum possible value ɛ=0.5 in cesium halides. First attempts to interpret these magneto-optical
results will be presented.
In honour of Prof. Fausto Fumi on the occasion of his retirement from teaching. |
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Keywords: | Magnetooptical effects |
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