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Optical Spectra of M, F 3 + ‐Singlet, and F 3 + ‐Triplet Centres in NaF
Author(s) -
Elsässer K.,
Seidel H.
Publication year - 1971
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.2220430131
Subject(s) - metastability , singlet state , line (geometry) , spectral line , excitation , orientation (vector space) , atomic physics , phonon , population , triplet state , materials science , chemistry , crystallography , excited state , physics , condensed matter physics , demography , organic chemistry , astronomy , sociology , geometry , mathematics , quantum mechanics
X irradiated NaF crystals contain after bleaching the F band mainly M and F 3 +centres. Complete orientation of the M centres and partial orientation of the F 3 +centres can be achieved. The F 3 +centres, identified by their 545.6 nm zero‐phonon line, have broad absorption bands at 512 and 303 nm. Upon strong excitation in the region of the 303 nm band a temporary bleaching of both the bands and the zero‐phonon line is found and ascribed to population of a metastable F 3 + ‐centre triplet state with a lifetime of τ = 1.9 s at 77 °K.
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