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On the Optical Absorption Spectrum of Co 2+ in CaF 2
Author(s) -
Alonso P. J.,
Alcalá R.
Publication year - 1977
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.2220810136
Subject(s) - absorption (acoustics) , crystal (programming language) , absorption spectroscopy , ground state , atomic physics , analytical chemistry (journal) , intensity (physics) , absorption band , materials science , chemistry , nuclear magnetic resonance , physics , optics , chromatography , computer science , programming language
The temperature evolution is measured of the absorption band centered at about 540 nm in the absorption spectrum of Co 2+ in CaF 2 at temperatures in the range from 80 to 320 K in order to check previous designations of the transitions that produce the band. Four peaks at 19100, 18560, 18450, and 17800 cm −1 are observed. The peak at 18565 cm −1 is assigned to the 4 A 2g ( 4 F) → 2 T 1g ( 2 G) transition of the Co 2+ in a cubic environment with values of Dq = 360 cm −1 , B = 930 cm −1 , and C / B = 4.47 for crystal‐field and Racah parameters, respectively. The other three peaks are assigned to transitions from the 4 A 2g ( 4 F) ground state to the Jahn‐Teller split 4 T 1g ( 4 P) triplet with the same Racah and crystal‐field parameters and with Jahn‐Teller parameters c 2 = 0.42 eV, ħω = 247 cm −1 , γ = 0.57. With these designations the temperature evolution of the peak positions and of the integrated intensity of the band are in good agreement with those predicted by the theory.