We present a study on the vacuum-ultraviolet VUV absorption properties of amorphous SiO2 a-SiO2 with high concentrations of silanol groups Si-OH . We found that the absorption spectra are made up of a couple of exponential profiles. The first, in the range from 7.5 to 8.1 eV, was attributed to Si-OH group absorption, while the second, in the range from 8.1 to 8.25 eV, was ascribed to the intrinsic absorption. The VUV absorption cross section of Si-OH groups in a-SiO2 was determined as well. The intrinsic absorption was found to be affected by the Si-OH concentration: high silanol group contents allow lower values of the Urbach energy. This result is interpreted in terms of a reduction in the degree of disorder in wet materials.

Vella, E., Boscaino, R., & Navarra, G. (2008). Vacuum-ultraviolet absorption of amorphous SiO2: intrinsic disorder and role of silanol groups. PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS, 77(16), 165203-1-165203-6 [10.1103/PhysRevB.77.165203].

Vacuum-ultraviolet absorption of amorphous SiO2: intrinsic disorder and role of silanol groups

VELLA, Eleonora;BOSCAINO, Roberto;NAVARRA, Giovanna
2008

Abstract

We present a study on the vacuum-ultraviolet VUV absorption properties of amorphous SiO2 a-SiO2 with high concentrations of silanol groups Si-OH . We found that the absorption spectra are made up of a couple of exponential profiles. The first, in the range from 7.5 to 8.1 eV, was attributed to Si-OH group absorption, while the second, in the range from 8.1 to 8.25 eV, was ascribed to the intrinsic absorption. The VUV absorption cross section of Si-OH groups in a-SiO2 was determined as well. The intrinsic absorption was found to be affected by the Si-OH concentration: high silanol group contents allow lower values of the Urbach energy. This result is interpreted in terms of a reduction in the degree of disorder in wet materials.
Settore FIS/01 - Fisica Sperimentale
Vella, E., Boscaino, R., & Navarra, G. (2008). Vacuum-ultraviolet absorption of amorphous SiO2: intrinsic disorder and role of silanol groups. PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS, 77(16), 165203-1-165203-6 [10.1103/PhysRevB.77.165203].
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/10447/38693
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