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Electronic Transitions in the Raman Spectra of FeCl 2 · 2 H 2 O and FeCl 2 · 2 D 2 O 1
Author(s) -
Graf L.
Publication year - 1978
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.2220880207
Subject(s) - raman spectroscopy , ion , raman scattering , anisotropy , chemistry , crystal (programming language) , field (mathematics) , spectral line , phonon , coupling (piping) , crystallography , atomic electron transition , symmetry (geometry) , magnon , analytical chemistry (journal) , condensed matter physics , materials science , physics , ferromagnetism , optics , mathematics , geometry , organic chemistry , astronomy , computer science , pure mathematics , metallurgy , programming language , chromatography
Raman spectra in FeCl 2 · 2 H 2 O (FC2) and FeCl 2 · 2 D 2 O (FC2D) are observed at 2 K. The electronic transitions of the Fe 2+ −ion in a crystal field are identified after a thorough assignment of the phonon lines in the four isomorphic compounds to symmetry types, using backscattering and 90°‐scattering techniques. The lowest of these phonons is known to be coupled resonantly to the magnons below T N . This coupling and other important magnetic properties of the iron salts are determined by the influence of the crystal field. With the approach of a rhombic symmetry the crystal field parameters are evaluated directly from the observed electronic transitions and related to the single‐ion anisotropy and the g ‐value of the iron salts. Also the reductions of spin—orbit couplings in FC2 and FC2D by covalency effects are discussed.