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Anomalous vibrational modes in acetanilide: a F.D.S. incoherent inelastic neutron scattering study

  • Mariette Barthes
  • Juergen Eckert
  • Susanna W. Johnson
  • Jacques Moret
  • Basil I. Swanson
  • Clifford J. Unkefer
Part II: Biosystems and Molecular Systems
  • 175 Downloads
Part of the Lecture Notes in Physics book series (LNP, volume 393)

Abstract

The origin of the anomalous infra-red and Raman modes in acetanilide (C6H5NHCOCH3, or ACN)(1) , remains a subject of considerable controversy. One family of theoretical models involves Davydov-like solitons (2) nonlinear vibrational coupling (3), or “polaronic” localized modes (4)(5). An alternative interpretation of the extra-bands in terms of a Fermi resonance was proposed (6) and recently the existence of slightly non-degenerate hydrogen atom configurations (7) in the H-bond was suggested as an explanation for the anomalies.

In this paper we report some new results on the anomalous vibrational modes in ACN that were obtained by inelastic incoherent neutron scattering (INS) . Comparisons of the spectra of ACN and of five deuterated derivatives, greatly facilitates assignments of the main features.

Keywords

Fermi Resonance Vibrational Coupling Methyl Mode Anomalous Mode Incoherent Neutron Scatter 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag 1991

Authors and Affiliations

  • Mariette Barthes
    • 1
  • Juergen Eckert
    • 2
  • Susanna W. Johnson
    • 2
  • Jacques Moret
    • 1
  • Basil I. Swanson
    • 3
  • Clifford J. Unkefer
    • 3
  1. 1.Groups de Dynamique des Phases CondenséesUniversité des SciencesMontpellierFrance
  2. 2.Los Alamos National LaboratoryLANSCELos AlamosUSA
  3. 3.Los Alamos National LaboratoryINC4Los AlamosUSA

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