The classical oscillator model and dielectric constants extracted from infrared reflectivity measurements

2007 ◽  
Vol 51 (1) ◽  
pp. 31-43 ◽  
Author(s):  
R.E. Kroon
Keyword(s):  
Dielectric Constants ◽  
Oscillator Model ◽  
Infrared Reflectivity ◽  
Classical Oscillator

Lattice Vibration Spectra XXIV*. Far-Infrared Reflection Spectra, Optical and Dielectric Constants, and Effective Charges of the Pyrite Type Compounds FeS2, MnS2, MnSe2, and MnTe2

1981 ◽  
Vol 36 (2) ◽  
pp. 184-190 ◽  
Author(s):  
H. D. Lutz ◽  
G. Kliche ◽  
H. Haeuseler
Keyword(s):  
Lattice Vibration ◽  
Far Infrared ◽  
Dielectric Constants ◽  
Reflection Spectra ◽  
Classical Oscillator ◽  
Infrared Reflection ◽  
Effective Charges ◽  
First Time ◽  
Born Effective Charge

AbstractFrom the far-infrared reflection spectra of the pyrite type compounds FeS2, MnS2, MnSe2, and MnTe2 we determined the TO and LO phonon frequencies at wave vector | q | ≈ 0 by both Kramers-Kronig analysis and classical oscillator fit method. In the case of MnSe2 and MnTe2 we found for the first time all five group-theoretically allowed reststrahlen bands. The phonon frequencies obtained from both single crystal and pressed pellet reflection measurements do not show any significant differences. The calculated optical and dielectric constants however are strongly affected by the surface quality of the sample. Effective ionic charges (Born effective charge, Szigeti charge) were calculated from the experimentally determined TO/LO splittings. They demonstrate an increasing ionicity in the order FeS2<MnTe2<MnSe2<MnS2.

Classical Oscillator Model on Canonical, Lie-Algebraic Deformation and Heisenberg-Weyl Algebra Deformation Nonrelativistic Space

2013 ◽  
Vol 52 (5) ◽  
pp. 1608-1620
Author(s):  
Cui-Bai Luo ◽  
Zheng-Wen Long ◽  
Chao-Yun Long ◽  
Shui-Jie Qin ◽  
Hai-Bo Luo
Keyword(s):  
Weyl Algebra ◽  
Oscillator Model ◽  
Classical Oscillator ◽  
Algebraic Deformation ◽  
Algebra Deformation

Dielectric Loss of Adsorbed Polar Molecules

1973 ◽  
Vol 51 (24) ◽  
pp. 4038-4047 ◽  
Author(s):  
T. McMullen
Keyword(s):  
Exact Solution ◽  
Dielectric Loss ◽  
Oscillator Model ◽  
Dielectric Susceptibility ◽  
Lattice Vibrations ◽  
Linear Coupling ◽  
Classical Oscillator ◽  
Ionic Solids ◽  
Density Of Phonon States ◽  
Diagrammatic Perturbation Theory

A theory of the dielectric susceptibility of polar gases adsorbed on ionic solids is presented. The rotational oscillator model of an adsorbed polar molecule is used, and dielectric loss is assumed to occur by phonon emission and absorption. For linear coupling of the rotational oscillator to the lattice vibrations, an exact solution is found using diagrammatic perturbation theory at finite temperature. In this model, appreciable loss is only found if the density of phonon states near the classical oscillator frequency is reasonably large, and it is suggested that this is to be expected in situations where the rotational oscillator model is valid. The method can be extended to more complex adsorbate–lattice interactions.

Analysis of the dielectric constants of the Ag2O film by spectroscopic ellipsometry and single-oscillator model

2010 ◽  
Vol 405 (7) ◽  
pp. 1922-1926 ◽  
Author(s):  
Xiao-Yong Gao ◽  
Hong-Liang Feng ◽  
Jiao-Min Ma ◽  
Zeng-Yuan Zhang ◽  
Jing-Xiao Lu ◽  
...  
Keyword(s):  
Spectroscopic Ellipsometry ◽  
Dielectric Constants ◽  
Oscillator Model ◽  
Single Oscillator Model ◽  
Single Oscillator ◽  
Ag2o Film
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