| Revue: | Brazilian journal of physics |
| Base de datos: | PERIÓDICA |
| Número de sistema: | 000203086 |
| ISSN: | 0103-9733 |
| Autores: | Peixoto, Luciano T1 |
| Instituciones: | 1Universidade Federal do Espirito Santo, Departamento de Fisica, Vitoria, Espirito Santo. Brasil |
| Año: | 2000 |
| Volumen: | 30 |
| Número: | 1 |
| Paginación: | 163-171 |
| País: | Brasil |
| Idioma: | Inglés |
| Tipo de documento: | Artículo |
| Enfoque: | Analítico |
| Resumen en inglés | Diagrammatic perturbation theory is used to consider the problem of the coupling of a molecular group libration to the lattice vibrations in solids exhibiting rotational tunneling detected by inelastic neutron scattering. The technique is applied to a molecular group of symmetry C3 in presence of the hindering potential of the solid. The spectral density for transitions between rotational tunneling states in the ground librational level is obtained as a function of temperature. Low temperature results are presented for different phonon spectrum parameters. They are used to check the assumption that this coupling is the origin of the peculiar behaviour of the line shifting and broadening as a function of temperature in the INS spectra of such systems |
| Disciplinas: | Física y astronomía |
| Palabras clave: | Física de materia condensada, Termodinámica y física estadística, Física estadística, Grupos moleculares, Estado sólido, Teoría de perturbaciones, Efecto tunel rotacional |
| Keyword: | Physics and astronomy, Condensed matter physics, Thermodynamics and statistical physics, Statistical physics, Molecular groups, Solid state, Perturbation theory, Rotational tunneling |
| Texte intégral: | Texto completo (Ver HTML) |
