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Optical Absorption by the Cu + Center in NaI
Author(s) -
Bateman R. L.,
van Sciver W. J.
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.2220460238
Subject(s) - oscillator strength , ion , impurity , absorption (acoustics) , atomic physics , copper , liquid nitrogen , center (category theory) , materials science , chemistry , physics , spectral line , crystallography , organic chemistry , astronomy , metallurgy , composite material
The color center which exhibits absorption in NaI at 4.84 eV and emission at 3.30 eV when measured at liquid nitrogen temperature is found to be the Cu + impurity center. The oscillator strength is determined by performing copper analysis on the same crystals which were measured optically. The value is found to be 0.24 ± 0.03 and to have a weak temperature dependence. The selection of the free ion transition responsible for the absorption is discussed with relation to the oscillator strength and its temperature dependence, the free ion energies of candidate transitions, and ionic size. It is felt that evidence for a choice between the allowed 3d 10 → 3d 9 4p and the parity forbidden 3d 10 → 3d 9 4s free ion transition is inconclusive at this time.