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Barrier crossing of H−and D−ions in CS(2) centers of hydrogenated SrF2:Pr3+

Authors
Journal
Journal of Physics and Chemistry of Solids
0022-3697
Publisher
Elsevier
Publication Date
Volume
58
Issue
10
Identifiers
DOI: 10.1016/s0022-3697(97)00185-6
Keywords
  • A. Inorganic Compounds
  • A. Optical Materials
  • D. Defects
  • D. Luminescence
  • D. Phonons

Abstract

Abstract By laser selective excitation and thermal cycling techniques, we studied photo-transformations and their reverting processes for the CS(2) center present in deuterated and hydrogenated SrF 2:Pr 3+ crystals. Excitation with a narrow-band laser produces persistent spectral holes and a spectral re-distribution within the inhomogeneously-broadened absorption line. Using a laser with a linewidth comparable to the absorption line we measured both reversible polarized-bleaching reorientations and photo-induced formation of a distinct photoproduct center. We measured the reverting temperatures of both the reoriented centers and photoproduct centers. The temperature for reverting CS∗(2) photoproduct centers is 82 ± 3 K, whereas the temperature for reverting reorientated CS(2) centers is 101 ± 3 K. The reverting temperatures for reorientation are identical for the H − and D − varieties of this center. These results are explained by barrier crossing in asymmetric double-well potentials and the respective barrier energies are estimated.

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