Effect of OH Content on the Far-Infrared Absorption and Nature of the Boson Peak in Silica Glass

1999 ◽  
Vol 68 (8) ◽  
pp. 2664-2668 ◽  
Author(s):  
Toshiaki Ohsaka ◽  
Tadanobu Shoji
Keyword(s):  
Infrared Absorption ◽  
Silica Glass ◽  
Far Infrared ◽  
Boson Peak ◽  
Oh Content

Fast Dynamics in Glass Forming Systems: Vibrations vs Relaxation

1996 ◽  
Vol 455 ◽  
Author(s):  
A. P. Sokolov
Keyword(s):  
Infrared Absorption ◽  
Far Infrared ◽  
Boson Peak ◽  
Scattering Data ◽  
Quasielastic Scattering ◽  
Glass Forming ◽  
Relaxation Channel ◽  
Infrared Absorption Spectra ◽  
Damped Oscillator ◽  
Vibrational Contribution

ABSTRACTTwo contributions specific for the spectra of the fast dynamics in glass forming systems, a broad quasielastic scattering and the boson peak, are analyzed. It is shown that the vibrational contribution (the boson peak) decreases strongly in fragile systems. Some speculations about dependence of the degree of fragility (a la Angeli) on peculiarity of the spectrum of fast dynamics are presented. The existence of some intrinsic relation between the broad quasielastic contribution and the boson peak is demonstrated from analysis of the recent neutron and Raman scattering data. It is shown that this relation can be explained in framework of the model of damped oscillator. The model ascribes the quasielastic contribution to the scattering of light or neutrons on the vibrations around the boson peak, which are damped by some relaxation channel and have a quasielastic part in their response function. It is demonstrated that the model can explain many peculiar properties of the fast dynamics in the Raman, neutron and far-infrared absorption spectra.

FAR INFRARED ABSORPTION IN ULTRAFINE AL PARTICLES DRUDE MODEL VERSUS GOR'KOV-ÉLIASHBERG THEORY

1977 ◽  
Vol 38 (C2) ◽  
pp. C2-93-C2-96 ◽  
Author(s):  
C. G. GRANQVIST ◽  
R. A. BUHRMAN ◽  
J. WYNS ◽  
A. J. SIEVERS
Keyword(s):  
Infrared Absorption ◽  
Far Infrared ◽  
Drude Model ◽  
Eliashberg Theory ◽  
Model Versus

scholarly journals Terahertz and Microwave Optical Properties of Single-Crystal Quartz and Vitreous Silica and the Behavior of the Boson Peak

2021 ◽  
Vol 11 (15) ◽  
pp. 6733
Author(s):  
Mira Naftaly ◽  
Andrew Gregory
Keyword(s):  
Single Crystal ◽  
Silica Glass ◽  
Broad Band ◽  
Peak Frequency ◽  
Vitreous Silica ◽  
Peak Height ◽  
Fused Silica ◽  
Boson Peak ◽  
Single Crystal Quartz ◽  
Crystal Quartz

Z-cut single-crystal quartz and vitreous silica (silica glass or fused silica) were evaluated for use as reference materials for terahertz and microwave measurements of complex permittivity, with Z-cut quartz confirmed as being suitable. Measurements of refractive indices and absorption coefficients for o-ray and e-ray in quartz and for vitreous silica are reported at frequencies between 0.2 and 6 THz and at 36 and 144 GHz, and compared with data reported in the literature. A previously unreported broad band was seen in the extraordinary absorption of quartz. The Boson peak in silica glass absorption was examined, and for the first time, two negative relationships have been observed: between the refractive index and the Boson peak frequency, and between the Boson peak height and its frequency.

Far-infrared absorption by small silver particles in gelatin

1990 ◽  
Vol 41 (11) ◽  
pp. 7421-7439 ◽  
Author(s):  
R. P. Devaty ◽  
A. J. Sievers
Keyword(s):  
Infrared Absorption ◽  
Far Infrared ◽  
Silver Particles

Absolute Far‐Infrared Absorption Intensities of α‐Nitrogen

1969 ◽  
Vol 50 (12) ◽  
pp. 5177-5183 ◽  
Author(s):  
Robert V. St. Louis ◽  
O. Schnepp
Keyword(s):  
Infrared Absorption ◽  
Far Infrared
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