Longitudinal phonons of translation along the 4̄ axis on urea |
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| Authors: | J. Lefebvre |
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| Affiliation: | Laboratoire de Physique du Solide, (Dynamique des Réseaux), Université des Sciences et Techniques de Lille 59650, Villeneuve d''Ascq, France |
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| Abstract: | The X-ray diffuse scatterinf along the 4̄ axis on urea gives the dispersion curves for the two longitudinal branches of translational motions. The experimental curves can be interpreted with a model of lattice dynamics. On the boundary Brillouin zone, the frequencies are 3.96 · 1012 Hz for the acoustical branch and 4.62 · 1012 Hz for the optical branch. These experimental results give the value of 4.66 Debyes for the dipole moment of urea. |
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