| Issue |
J. Phys. Colloques
Volume 42, Number C6, Décembre 1981
International Conference on Phonon Physics
|
|
|---|---|---|
| Page(s) | C6-725 - C6-727 | |
| DOI | https://doi.org/10.1051/jphyscol:19816212 | |
International Conference on Phonon Physics
J. Phys. Colloques 42 (1981) C6-725-C6-727
DOI: 10.1051/jphyscol:19816212
Clarendon Laboratory, University of Oxford, Oxford, U.K.
J. Phys. Colloques 42 (1981) C6-725-C6-727
DOI: 10.1051/jphyscol:19816212
OBSERVATION OF COUPLED AMPLITUDE MODES IN THE RAMAN SPECTRUM OF INCOMMENSURATE γ-Na2CO3
A. Maciel et J.F. RyanClarendon Laboratory, University of Oxford, Oxford, U.K.
Abstract
The Raman spectrum of incommensurate γ-Na2CO3 reveals an additional number of modes which are activated by the distortion. A complex coupled mode spectrum observed at low frequencies is interpreted as arising from an interaction of acoustic and librational dispersion branches at the incommensurate wavevector. The high-frequency internal mode ν1 of the CO2-3 ions is observed as a doublet whose splitting varies with temperature as (TI-T)2β with β 0.35.