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EnglishNew Raman and incoherent neutron scattering data at various temperatures and molecular-dynamic simulations in amorphous silica are compared to obtain the Raman coupling coefficient C(omega) and, in particular, its low-frequency limit. This study indicates that in the omega --> 0 limit C(omega) extrapolates to a non vanishing value, giving important indications on the characteristics of the vibrational modes in disordered materials; in particular our results indicate that even in the limit of very long wavelength the local disorder implies non regular local atomic displacements.
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| Titolo: | The Raman coupling function in amorphous silica and the nature of the long-wavelength excitations in disordered systems |
| Autori: | |
| Data di pubblicazione: | 1999 |
| Rivista: | |
| Abstract: | New Raman and incoherent neutron scattering data at various temperatures and molecular-dynamic simulations in amorphous silica are compared to obtain the Raman coupling coefficient C(omega) and, in particular, its low-frequency limit. This study indicates that in the omega --> 0 limit C(omega) extrapolates to a non vanishing value, giving important indications on the characteristics of the vibrational modes in disordered materials; in particular our results indicate that even in the limit of very long wavelength the local disorder implies non regular local atomic displacements. |
| Handle: | http://hdl.handle.net/11582/163012 |
| Appare nelle tipologie: | 1.1 Articolo in rivista |
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