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Near‐Infrared d–d Transitions of NiI 2 , CdI 2 :Ni 2+ , and CoI 2
Author(s) -
Kuindersma S. R.,
Boudewijn P. R.,
Haas C.
Publication year - 1981
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.2221080122
Subject(s) - ion , spectral line , absorption spectroscopy , absorption (acoustics) , atomic physics , infrared , physics , birefringence , crystal (programming language) , electron , infrared spectroscopy , materials science , condensed matter physics , optics , quantum mechanics , computer science , programming language , astronomy
The absorption spectra of NiI 2 , CdI 2 :Ni 2+ , and CoI 2 in the wave‐number region 4000 to 16000 cm −1 are reported. The spectra are interpreted in terms of d‐d transitions of Ni 2+ and Co 2+ ions. Parameters of the electron repulsion, cubic crystal field, and spin‐orbit coupling are estimated. From the latter the transferred spin densities are deduced and compared with Mössbauer data. Birefringence experiments as a function of the temperature show the presence of two phase transitions in niI 2 .

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