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Photoinduced absorption spectra of ZnS:Fe crystals
Author(s) -
Zimmermann H.,
Boyn R.,
Nagel N.
Publication year - 1983
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.2221170124
Subject(s) - photoionization , spectral line , absorption spectroscopy , electron paramagnetic resonance , absorption (acoustics) , atomic physics , excitation , materials science , band gap , ground state , chemistry , analytical chemistry (journal) , molecular physics , nuclear magnetic resonance , optics , ion , ionization , physics , optoelectronics , composite material , organic chemistry , astronomy , chromatography , quantum mechanics
Photoinduced absorption (PA) spectra of ZnS:Fe crystals are measured between 0.3 and 3.6 eV by means of a modulation technique. Transitions related to the charge states Fe 3+ and Fe + , which have been detected by EPR a long time ago, are believed to be seen in these spectra. In particular, the processes Fe 3+ → Fe 2+ + h and Fe 2+ + Fe 3+ + e are identified, the latter manifesting itself most clearly in the excitation spectrum of the PA band due to the former transition. The shapes of the photoneutralization and photoionization spectra are discussed, and the position of the Fe + ground state in the forbidden gap is estimated.