Spin-orbit coupling, spin-lattice relaxation, and spin-memory studies of F-center-molecular-ion pairs in alkali halides

G. Baldacchini, S. Botti, U.M. Grassano, F. Luty

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Abstract

The spin-orbit parameter Δ, spin-lattice relaxation time T 1, and spin-mixing parameter e{open} of F H(OH-) and F 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 the F center with the molecular ion has been made. In crystals of NaCl structure the negative spin-orbit parameter Δ changes little between F and F H centers in the same host. For CsCl and CsBr two values of Δ have been derived for F H(CN-) centers with axis parallel or perpendicular to the magnetic field. In all studied systems, the spin-lattice relaxation time T 1 is already shorter before aggregation compared to F formation. The spin-mixing parameter e{open} decreases slightly for F H(OH-) compared to F centers, while it increases drastically for F H(CN-) defects and reaches its maximum possible value e{open}=0.5 in cesium halides. First attempts to interpret these magneto-optical results will be presented. © 1993 Società Italiana di Fisica.
Original languageEnglish
Pages (from-to)207 - 228
Number of pages22
JournalNuovo Cimento della Societa Italiana di Fisica D - Condensed Matter, Atomic, Molecular and Chemical Physics, Biophysics
Volume15
Issue number2-3
DOIs
Publication statusPublished - Feb 1993
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Ocean Engineering
  • Mechanical Engineering
  • Electrical and Electronic Engineering
  • Control and Systems Engineering
  • Engineering (miscellaneous)
  • Nuclear Energy and Engineering
  • Computer Science Applications
  • Chemical Engineering(all)

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