Theory of 45 degrees reflectometry from metal surfaces
The use of optical spectroscopies to study surfaces is hindered by the difficulty of disentangling bulk and surface contributions to the signal. According to Fresnel formulae, the a and p reflectances R of a semi-infinite system obey the simple relation Delta = R-s(2) - R-p = 0 when the incidence an...
| Autores: | , , |
|---|---|
| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 1998 |
| País: | México |
| Institución: | Universidad Nacional Autónoma de México |
| Repositorio: | Sistema de Información de la Facultad de Ciencias, UNAM |
| OAI Identifier: | oai:repositorio.fciencias.unam.mx:11154/2693 |
| Acceso en línea: | http://hdl.handle.net/11154/2693 |
| Access Level: | acceso abierto |
| Palabra clave: | Materials Science, Multidisciplinary Physics, Applied Physics, Condensed Matter |
| Sumario: | The use of optical spectroscopies to study surfaces is hindered by the difficulty of disentangling bulk and surface contributions to the signal. According to Fresnel formulae, the a and p reflectances R of a semi-infinite system obey the simple relation Delta = R-s(2) - R-p = 0 when the incidence angle is 45 degrees. Deviations from this result can be related to microscopic surface contributions to R. In this paper we study theoretically Delta for metal surfaces. For a semi-infinite nat jellium we obtain the contributions to Delta from electronic excitations at the surface. To explore Delta for non-jellium conductors, we apply a 'Swiss cheese' model to different surfaces of Ag. |
|---|