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Optical Absorption of Mn 2+ ‐Doped Alkali Halides
Author(s) -
Mehra A.
Publication year - 1968
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.19680290237
Subject(s) - alkali metal , halide , manganese , excited state , dopant , chemistry , divalent , analytical chemistry (journal) , absorption spectroscopy , absorption (acoustics) , ion , spectral line , doping , inorganic chemistry , materials science , atomic physics , physics , optics , optoelectronics , organic chemistry , chromatography , astronomy , composite material
The absorption spectra of Mn 2+ ‐doped KCl and NaCl are discussed over 0.1 to 15 mol% cange of dopant concentration. The spectra observed for concentrations > 5 mol% are characteristic of divalent manganese and the bands are assigned to various excited quartet levels of the ion in a cubic crystalline field. The band positions are fitted by adjusting B , C , Dq , and α parameters. Fine structure of the bands observed at 77 °K is interpreted in terms of the vibrational–electronic and spin–orbit splitting of the cubic field levels. The different types of Mn 2+ centres in the alkali halides at different concentrations are discussed in the light of the observed spectra. The formation of K 4 MnCl 6 and NaMnCl 3 complexes is thought to be probable at high concentrations.