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Self‐Trapped States of Amide I Excitations in the Hydrogn‐Bonded Chain of Peptide Groups
Author(s) -
Ichinose S.
Publication year - 1991
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.2221630207
Subject(s) - excitation , lattice (music) , soliton , nonlinear system , amide , physics , hydrogen bond , vibration , trapping , coupling (piping) , chemistry , molecular physics , quantum mechanics , classical mechanics , materials science , molecule , acoustics , ecology , organic chemistry , metallurgy , biology
A theory is proposed of interactions of the Amide I excitation with lattice distortions in the hydrogen‐bonded chain of peptide groups. By studying the classical equations of motion, exact one‐soliton solutions are given in the case of the continuum limit. It is shown that the moving acoustic soliton may capture the Amide I excitation. On the other hand, the longitudinal sound velocity is slightly decreased due to the coupling between them. The nonlinearity of the hydrogn‐bond generates thus both a self‐trapping mechanism for Amide I excitations and an acoustic soliton formation for lattice vibrations.