J. Phys. I France
Volume 2, Numéro 10, October 1992
Page(s) 1929 - 1939
DOI: 10.1051/jp1:1992256
J. Phys. I France 2 (1992) 1929-1939

Anomalous vibrational modes in acetanilide as studied by inelastic neutron scattering

Mariette Barthes1, Juegen Eckert2, Susanna W. Johnson2, Jacques Moret1, Basil I. Swanson3 and Clifford J. Unkefer3

1  Groupe de Dynamique des Phases Condensées, Université des Sciences, 34095 Montpellier, France
2  LANSCE, Los Alamos National Laboratory, Los Alamos, NM 87545, U.S.A.
3  INC4, Los Alamos National Laboratory, Los Alamos, NM 87545, U.S.A.

(Received 19 Nobember 1991, accepted in final form 19 June 1992)

A study of the anomalous modes in acetanilide and five deuterated derivatives by incoherent inelastic neutron scattering is reported. These data show that the dynamics of the amide and methyl groups influence each other. In addition, the anomalous temperature behaviour of the NH out-of-plane bending mode is confirmed. These observations suggest that the self-trapping mechanism in ACN may be more complex than hitherto assumed.

© Les Editions de Physique 1992

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