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On Conditions of Spectroscopic Manifestation of the Dynamical Jahn‐Teller Effect
Author(s) -
Fugol I. Ya.,
Ratner A. M.,
Yurtaeva E. M.
Publication year - 1990
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.2221600123
Subject(s) - van der waals force , impurity , jahn–teller effect , symmetry (geometry) , spectral line , vibration , lattice (music) , condensed matter physics , lattice vibration , absorption spectroscopy , chemistry , crystal (programming language) , physics , molecular physics , atomic physics , ion , phonon , optics , quantum mechanics , molecule , geometry , mathematics , computer science , acoustics , programming language
Abstract Impurity level splitting in a crystal due to the lowering of the lattice symmetry under its vibrations is considered. Since the interaction of low‐symmetry vibrations with the optical center is generally weaker than that of the full‐symmetry one which makes the optical lines broader, the dynamic level splitting is masked by the broadening. The dynamic splitting manifests itself by a mechanism which promotes weakening in the interaction of the optical center with the full‐symmetry vibration rather than with the low‐symmetry ones. In the case of rare‐gas crystals with atomic impurities such a mechanism is associated with the compensation of contributions of repulsive forces and the Van der Waals attraction to the line brodening. The degree of compensation correlates with that of spectral separation of the splitting components in experimental absorption spectra.