Temperature Change of the Far-Infrared Absorption and Nature of Low-Frequency Modes in Silica Glass

2000 ◽  
Vol 69 (11) ◽  
pp. 3711-3714 ◽  
Author(s):  
Toshiaki Ohsaka ◽  
Tadanobu Shoji ◽  
Kazuya Tanaka
Keyword(s):  
Temperature Change ◽  
Infrared Absorption ◽  
Silica Glass ◽  
Low Frequency ◽  
Far Infrared

Infrared Absorption by Granular Metals

1990 ◽  
Vol 195 ◽  
Author(s):  
D.B. Tanner ◽  
Y.H. Kim ◽  
C.L. Carr
Keyword(s):  
Infrared Absorption ◽  
Electric Dipole ◽  
Low Frequency ◽  
Far Infrared ◽  
Percolation Transition ◽  
Metallic Particles ◽  
Tenfold Increase ◽  
Normal Metals ◽  
Theoretical Predictions ◽  
The Individual

ABSTRACTThe infrared properties of granular metals and superconductors are qualitatively in accord with effective medium ideas, with insulating behavior below a percolation transition and metallic response above. An exception is the far-infrared absorption at low metallic concentrations, which is much stronger than theoretical predictions. Measurements of superconductors and of normal metals in different hosts suggest that this absorption is predominately electric dipole rather than the magnetic dipole (eddy current) absorption which is expected to be the dominant low-frequency loss in highly conducting particles. Measurements of clustered and non-clustered samples suggest that the strong far-infrared absorption does not arise from the clustering together of the individual metallic particles, although clustering does lead to about a tenfold increase in absorption.

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

Far Infrared Group Frequencies. V. Oximes and Aldoximes

1973 ◽  
Vol 27 (1) ◽  
pp. 22-26 ◽  
Author(s):  
S. M. Craven ◽  
F. F. Bentley ◽  
D. F. Pensenstadler
Keyword(s):  
Hydrogen Bond ◽  
Infrared Spectra ◽  
Low Frequency ◽  
Far Infrared ◽  
Torsional Vibrations ◽  
Lattice Vibrations ◽  
Dilute Solutions ◽  
Solid Samples ◽  
Bending Modes ◽  
Bond Stretch

The low frequency infrared spectra from 450 to 75 cm−1 of seven oximes and five aldoximes have been recorded for pure samples and for dilute solutions in cyclohexane. An intense characteristic band is present in the solution spectra at 367 ± 10 cm−1. This characteristic band shifts to 275 ± 10 cm−1 in the spectra of the OD compounds. The 367 ± 10 cm−1 and 275 ± 10 cm−1 bands are assigned to OH and OD torsional vibrations. A comparison of the solution spectra with spectra of the solid samples indicated that the OH … N hydrogen bond stretch of oximes and aldoximes occurs in 300 to 200 cm−1 region. Strong bands also are present in 140 to 100 cm−1 region which are due to OH … N bending modes or perhaps lattice vibrations.

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
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