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Herzberg‐Teller Interaction and Vibronic Coupling in Molecular Crystals. II. The Simple Model with Inclusion of a Frequency Change in the Non‐Totally Symmetric Vibration
Author(s) -
Zgierski M. Z.
Publication year - 1974
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.2220620104
Subject(s) - phonon , vibronic coupling , coupling (piping) , symmetry (geometry) , simple (philosophy) , vibration , vibronic spectroscopy , zero (linguistics) , molecular vibration , absorption spectroscopy , work (physics) , molecular physics , chemistry , physics , quantum mechanics , computational chemistry , molecule , materials science , mathematics , geometry , philosophy , epistemology , linguistics , metallurgy
The simple model introduced in part I of this work, allowing for a theoretical investigation of symmetry‐forbidden vibronic absorption bands of molecular crystals, is extended in order to include the possibility of a frequency change of the non‐totally symmetric vibration which couples two molecular states with help of the Herzberg‐Teller mechanism. A formula for the absorption coefficient in the zero‐phonon approximation is derived and discussed. One‐ and two‐phonon regions of the spectrum are investigated.