Spectroscopic evidence for Davydov-like solitons in acetanilide
Abstract
Detailed measurements of infrared absorption and Raman scattering on crystalline acetanilide [(CH3CONHC6H5)x] at low temperature show a new band close to the conventional amide I band. Equilibrium properties and spectroscopic data rule out explanations based on a conventional assignment, crystal defects, Fermi resonance, and upon frozen kinetics between two different subsystems. Thus we cannot account for this band using the concepts of conventional molecular spectroscopy, but a soliton model, similar to that proposed by Davydov for -helix in protein, is in satisfactory agreement with the experimental data. © 1984 The American Physical Society.
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