| Numéro |
J. Phys. Colloques
Volume 42, Numéro C6, Décembre 1981
International Conference on Phonon Physics
|
|
|---|---|---|
| Page(s) | C6-608 - C6-610 | |
| DOI | https://doi.org/10.1051/jphyscol:19816178 | |
International Conference on Phonon Physics
J. Phys. Colloques 42 (1981) C6-608-C6-610
DOI: 10.1051/jphyscol:19816178
Laboratoire d'optique Appliquée, Ecole Polytechnique, Ecole NationaleSupérieure de Techniques Avancées, Batterie de l'Yvette, 91120 Palaiseau, France
J. Phys. Colloques 42 (1981) C6-608-C6-610
DOI: 10.1051/jphyscol:19816178
A CALCULATION OF THE PHONON DISPERSION CURVES IN TRIGONAL AND MONOCLINIC SELENIUM WITH THE HELP OF A SINGLE VIBRATIONAL POTENTIAL
M. Merian et J. EtchepareLaboratoire d'optique Appliquée, Ecole Polytechnique, Ecole NationaleSupérieure de Techniques Avancées, Batterie de l'Yvette, 91120 Palaiseau, France
Abstract
We present phonon dispersion curves in trigonal Selenium (chains) and zone center phonons in α monoclinic Selenium (rings) calculated with the same internal force constants. Most of their differences in phonon energies can be explained by intermolecular interactions which in both case promote a tetrahedral neihbouring leaving some danglin bonds in monoclinic Se. Long range forces of the Van der Waals type were neglected in first approximation.