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Vibration‐Spectroscopic Studies on Solid Compounds
Author(s) -
Becher Hermann J.
Publication year - 1972
Publication title -
angewandte chemie international edition in english
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 0570-0833
DOI - 10.1002/anie.197200261
Subject(s) - lattice vibration , vibration , raman spectroscopy , lattice (music) , ionic crystal , spectroscopy , polarization (electrochemistry) , ionic bonding , lattice constant , coulomb , molecular physics , chemistry , force constant , infrared spectroscopy , molecular vibration , computational chemistry , molecule , materials science , physics , condensed matter physics , quantum mechanics , ion , diffraction , acoustics , phonon , electron
Considerably improved possibilities are now available for the investigation of the optical vibrations in lattice compounds by Raman and IR spectroscopy. These spectra can be interpreted on the basis of the models and findings of molecular vibration spectroscopy. For simple lattice types simple frequency equations are found for the optical lattice vibrations with in‐phase vibration motions in all unit cells (wave vector k = 0). As an approximation, the force constants that occur in these equations may be interpreted as stretching force constants. For typical ionic lattices, the influence of Coulomb forces due to the lattice polarization that occurs during the vibrational motion must be taken into account. As is shown by the example of some spinels, the assignment of lattice vibrations can be facilitated by model calculations.