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EPR Spectroscopy of Thulium Impurities in ZnS Crystals
Author(s) -
Müller St.,
Dziesiaty J.
Publication year - 1994
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221840222
Subject(s) - impurity , thulium , electron paramagnetic resonance , photoionization , spectroscopy , ion , materials science , atomic physics , chemistry , nuclear magnetic resonance , doping , physics , ionization , optoelectronics , organic chemistry , quantum mechanics
EPR spectroscopy is applied to Tm impurities in ZnS crystals containing Ag, Li, and La codopants. After optical irradiation, Tm 2+ resonances are observed and make it possible to separate different interstitial sites occupied by Tm 2+ , cubic sites without local charge compensation and axially distorted ones with [111] w and [001] symmetry due to charge compensation by neighboured defects. Additionally a light‐insensitive signal could be ascribed to Tm 3+ ions, occupying substitutional (Zn)sites, compensated by a negatively charged defect in 〈110〉 directions. From the photoionization spectrum the Tm 2+ state is located in the upper half of the band gap.