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The M + Center in CaF 2
Author(s) -
Collins W. C.
Publication year - 1973
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.2220560128
Subject(s) - impurity , luminescence , absorption (acoustics) , colored , absorption band , irradiation , excitation , doping , materials science , center (category theory) , trapping , ultraviolet , analytical chemistry (journal) , atomic physics , optoelectronics , photochemistry , optics , chemistry , physics , crystallography , nuclear physics , ecology , organic chemistry , quantum mechanics , composite material , biology , chromatography
Abstract S‐irradiation of additively colored CaF 2 at low temperature produces two new absorption bands at 545 and 360 nm at the expense of the M band at 519 nm. These same bands can also be produced by ultraviolet bleaching at low temperature of additively colored CaF 2 doped with electron trapping impurities. In addition, excitation into either band gives rise to a luminescence band peaking at 645 nm, and both absorption bands can be reversibly bleached with visible light. We propose that these bands arise from the M + center.