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:

Synergism at a Liquid-Solid Interface. Adsorption of Binary Mixtures of Bile Salts onto a Cholesterol Surface

Langmuir ◽  
1994 ◽  
Vol 10 (4) ◽  
pp. 1268-1273 ◽  
Author(s):  
F. Gonzalez-Caballero ◽  
M. L. Kerkeb
Keyword(s):  
Binary Mixtures ◽  
Bile Salts ◽  
Solid Interface

scholarly journals Volatile Gas Sensing through Terahertz Pipe Waveguide

Sensors ◽  
2020 ◽  
Vol 20 (21) ◽  
pp. 6268
Author(s):  
Ja-Yu Lu ◽  
Borwen You ◽  
Jiun-You Wang ◽  
Sheng-Syong Jhuo ◽  
Tun-Yao Hung ◽  
...  
Keyword(s):  
Dipole Moment ◽  
Strong Interaction ◽  
Reflectance Spectrum ◽  
Gas Sensing ◽  
Thz Radiation ◽  
Hollow Core ◽  
Label Free ◽  
Vapor Absorption ◽  
Gas Molecule ◽  
Volatile Liquids

Gas sensing to recognize volatile liquids is successfully conducted through pipe-guided terahertz (THz) radiation in a reflective and label-free manner. The hollow core of a pipe waveguide can efficiently deliver the sensing probe of the THz confined waveguide fields to any place where dangerous vapors exist. Target vapors that naturally diffuse from a sample site into the pipe core can be detected based on strong interaction between the probe and analyte. The power variation of the THz reflectance spectrum in response to various types and densities of vapors are characterized experimentally using a glass pipe. The most sensitive THz frequency of the pipe waveguide can recognize vapors with a resolution at a low part-per-million level. The investigation found that the sensitivity of the pipe-waveguide sensing scheme is dependent on the vapor absorption strength, which is strongly related to the molecular amount and properties including the dipole moment and mass of a gas molecule.

Pressure-induced absorption in nonpolar gases containing tetrahedral molecules

1976 ◽  
Vol 54 (5) ◽  
pp. 611-617 ◽  
Author(s):  
A. D. Buckingham ◽  
A. J. C. Ladd
Keyword(s):  
Dipole Moment ◽  
Field Gradient ◽  
Infrared Radiation ◽  
Far Infrared ◽  
Spectral Moment ◽  
Induced Absorption ◽  
Integrated Intensity ◽  
Tetrahedral Molecules ◽  
Spherical Molecule ◽  
Far Infrared Radiation

The theory of pressure-induced absorption of far infrared radiation by gases is extended to include the contribution of the dipole moment induced in a molecule by the field gradient due to its neighbours. This dipole is nonzero when the molecule lacks a centre of inversion, as in a tetrahedron. In the collision of two tetrahedra, the dipole induced in molecule 2 by the electric field of the octopole moment Ω1 of the partner leads to transitions in which ΔJ(1) = 0, ± 1, ±2, ±3, and ΔJ(2) = 0. The dipole induced by the field gradient of Ω1 leads to ΔJ(1) = 0, ±1, ±2, ±3, and ΔJ(2) = 0, ±1, ±2, ±3, and therefore gives a required increase in absorption at higher frequencies. The field-gradient contribution vanishes in a collision involving a tetrahedral and a spherical molecule. General expressions are given for the field-gradient contributions to the integrated intensity and to the −2 spectral moment.

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.

Determination of the dipole moments of molecular ions from the rotational Zeeman effect by tunable far-infrared laser spectroscopy

1988 ◽  
Vol 324 (1578) ◽  
pp. 109-119 ◽  
Keyword(s):  
Dipole Moment ◽  
Experimental Determination ◽  
Laser Spectroscopy ◽  
Dipole Moments ◽  
Zeeman Effect ◽  
Far Infrared ◽  
Molecular Ions ◽  
Far Infrared Laser ◽  
Infrared Laser Spectroscopy

The details of the first experimental determination of the dipole moment of a molecular ion from the rotational Zeeman effect are presented, along with an assessment of the ultimate accuracy of the technique.

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