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Deformation of Molecular Crystals at Electronic Excitation
Author(s) -
Davydov A. S.
Publication year - 1969
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.19690360123
Subject(s) - excitation , exciton , crystal (programming language) , resonance (particle physics) , deformation (meteorology) , molecule , atomic physics , condensed matter physics , molecular physics , plane (geometry) , effective mass (spring–mass system) , physics , materials science , geometry , classical mechanics , quantum mechanics , mathematics , meteorology , computer science , programming language
In this article an investigation is made of deformation of the molecular crystal due to electronic excitation. It is shown that in a three‐dimensional crystals at a sufficiently large resonance interaction between molecules the states of free excitations with positive effective mass correspond to minimum of the total energy of the crystal. The transition to local excitations requires activation energy. The states of the free excitons with negative effective masses in three‐dimensional and one‐dimensional crystals are unstable. Exciton states with positive effective masses in one‐dimensional crystals are represented as modulated plane waves. Distribution of the excitation along some length of the crystal corresponds to these waves. The stronger is the resonance interaction between molecules, the more is this length.