scholarly journals A Study on the Transversal Optical Mode in Amorphous Gallium Arsenide

1998 ◽  
Vol 21 (3) ◽  
pp. 209-211
Author(s):  
M. A. Grado-Caffaro ◽  
M. Grado-Caffaro
Keyword(s):  
Gallium Arsenide ◽  
Dipole Moment ◽  
Matrix Element ◽  
Infrared Spectrum ◽  
Far Infrared ◽  
Moment Matrix ◽  
Optical Mode ◽  
Structural Disorders

Contributions to the far-infrared spectrum corresponding to both dynamical and structural disorders in a-GaAs are examined when frequency coincides with the transversal optical mode. Under these circumstances, dipole moment matrix element is discussed.

STRUCTURAL DISORDER IN AMORPHOUS III–V COMPOUNDS

1994 ◽  
Vol 08 (04) ◽  
pp. 247-250 ◽  
Author(s):  
M.A. GRADO CAFFARO ◽  
M. GRADO CAFFARO
Keyword(s):  
Dipole Moment ◽  
Matrix Element ◽  
Far Infrared ◽  
Structural Disorder ◽  
Angular Frequency ◽  
Infrared Range ◽  
Maximum Frequency ◽  
Moment Matrix ◽  
Low Frequencies ◽  
First Derivative

Some new results on structural disorder in amorphous III–V semiconductors are established. In particular, a relationship is obtained for the maximum frequency (in the far-infrared range) at which |µ(ω)|/ω is constant (µ(ω) is the dipole moment matrix element in the angular frequency domain). The mathematical behaviors of |µ(ω)| and its first derivative are discussed. Furthermore, absorption coefficient at very low frequencies is determined analytically and compared with the experiment.

scholarly journals A Short Theoretical Note on Optical Absorption of Amorphous Gallium Arsenide in the Infrared Range

1998 ◽  
Vol 20 (3) ◽  
pp. 139-142 ◽  
Author(s):  
M. A. Grado-Caffaro ◽  
M. Grado-Caffaro
Keyword(s):  
Gallium Arsenide ◽  
Optical Absorption ◽  
Absorption Coefficient ◽  
Far Infrared ◽  
Optical Absorption Coefficient ◽  
Infrared Range ◽  
Structural Disorders ◽  
Theoretical Results

An approach to determine the optical absorption coefficient of amorphous GaAs in the far infrared range is developed. Results from this approach are compared with experiment and with other theoretical results. In our formulation, contributions corresponding to both dynamical and structural disorders are taken into consideration.

Quantitative analysis of the dipole-moment matrix element for molecules of symmetry C2V

1979 ◽  
Vol 22 (9) ◽  
pp. 1026-1028
Author(s):  
O. K. Voitsekhovskaya ◽  
Yu. S. Makushkin ◽  
V. N. Cherepanov
Keyword(s):  
Dipole Moment ◽  
Quantitative Analysis ◽  
Matrix Element ◽  
Moment Matrix

The Dipole Moment Derivative of the Hydrogen Bond in Ice

1972 ◽  
Vol 50 (3) ◽  
pp. 310-314 ◽  
Author(s):  
E. Whalley
Keyword(s):  
Hydrogen Bond ◽  
Dipole Moment ◽  
Infrared Spectrum ◽  
Effective Charge ◽  
Far Infrared ◽  
Quadrupole Moments ◽  
Charge Distributions ◽  
Hydrogen Bond Interactions ◽  
Integrated Intensity

The dipole moment derivative of the hydrogen bond in ice has been calculated assuming that the molecules can be represented as non-overlapping polarizable charge distributions characterized by dipole and quadrupole moments. The value is 0.1 electron charges which is about one third of the experimental value obtained from the far-infrared spectrum. The model predicts therefore only about one tenth of the experimental integrated intensity from which the effective charge was derived. Most of the intensity must therefore be due to specific hydrogen-bond interactions.

The collision-induced translational spectrum of CF4–He gas mixtures

1980 ◽  
Vol 58 (6) ◽  
pp. 836-839 ◽  
Author(s):  
A. D. Afanasev ◽  
M. O. Bulanin ◽  
M. V. Tonkov
Keyword(s):  
Dipole Moment ◽  
Infrared Spectrum ◽  
Far Infrared ◽  
Gas Mixtures ◽  
Moment Function ◽  
Band Shape ◽  
Induced Dipole

The collision-induced far infrared spectrum of CF4–He gas mixtures was measured at 213 K. It is shown that the observed enhancement of the absorption represents the translational spectrum induced by isotropic overlap forces. The band shape calculations are consistent with the assumption that the collision-induced dipole moment varies exponentially with intermolecular separation, and the parameters of the dipole moment function have been determined.

The far infrared spectrum of H2O2 observed and calculated rotational levels of the torsional states : (n, τ) = (0, 1), (0, 3) and (1, 1)

1988 ◽  
Vol 49 (11) ◽  
pp. 1901-1910 ◽  
Author(s):  
F. Masset ◽  
L. Lechuga-Fossat ◽  
J.-M. Flaud ◽  
C. Camy-Peyret ◽  
J.W.C. Johns ◽  
...  
Keyword(s):  
Infrared Spectrum ◽  
Far Infrared

Far-infrared spectrum and ground state constants of methyl amine

1987 ◽  
Vol 126 (2) ◽  
pp. 443-459 ◽  
Author(s):  
Nobukimi Ohashi ◽  
Kojiro Takagi ◽  
Jon T. Hougen ◽  
W.Bruce Olson ◽  
Walter J. Lafferty
Keyword(s):  
Infrared Spectrum ◽  
Ground State ◽  
Far Infrared ◽  
Methyl Amine

scholarly journals Collision-induced Spectra at a Gas-Solid Interface

1984 ◽  
Vol 37 (1) ◽  
pp. 63
Author(s):  
J Mahanty
Keyword(s):  
Dipole Moment ◽  
Time Dependence ◽  
Binary Mixtures ◽  
Optical Activity ◽  
Far Infrared ◽  
Inert Gases ◽  
Similar Process ◽  
Solid Interface ◽  
Gas Molecule ◽  
Typical Model

In analogy with collision-induced translational absorption in the far infrared in binary mixtures of inert gases, it is suggested that a similar process mustoccur at a gas-solid interface. Each gas molecule develops a dipole moment that depends on its distance from the surface, and its time dependence due to the thermal motion of the molecule should cause optical activity. The necessary theory and expected absorption curves for a typical model are given:

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