Far-Infrared Spectra of Acetanilide Revisited

Authors :: H. Kellouai
G. De Nunzio
A. Spire
Mariette Barthes
A., Spire
M., Barthe
H., Kellouai
DE NUNZIO, Giorgio
Source :: Scopus-Elsevier
Publication Year :: 2000
Publisher :: Elsevier BV:PO Box 211, 1000 AE Amsterdam Netherlands:011 31 20 4853757, 011 31 20 4853642, 011 31 20 4853641, EMAIL: nlinfo-f@elsevier.nl, INTERNET: http://www.elsevier.nl, Fax: 011 31 20 4853598, 2000.
Abstract: A new investigation of the temperature dependence of the far-infrared spectra of acetanilide and some isotopomers is presented. Four absorption bands are considered at 31, 42, 64, and 80 cm −1 , and no significant change of their integrated intensity is observed when reducing the temperature. The temperature induced frequency shift values and other properties of these bands are consistent with an assignment as anharmonic lattice phonons. These results rule out the assignment of the 64, 80, and 106 cm −1 bands as normal modes of the polaronic excitation, as previously suggested.