IR absorption spectra of nematic liquid crystals oriented by an external a.c. electric field

1982 ◽  
Vol 23 (2) ◽  
pp. 125-142 ◽  
Author(s):  
N. Kirov ◽  
P. Simova ◽  
H. Ratajczak
Keyword(s):  
Liquid Crystals ◽  
Electric Field ◽  
Absorption Spectra ◽  
Nematic Liquid Crystals ◽  
Ir Absorption ◽  
Ir Absorption Spectra

Average Dielectric Constant of Coated Spheres: Application to the IR Absorption Spectra of NiO and MgO

1993 ◽  
Vol 47 (8) ◽  
pp. 1203-1208 ◽  
Author(s):  
C. Pecharroman ◽  
T. Gonzalez Carreno ◽  
J. E. Iglesias
Keyword(s):  
Dielectric Constant ◽  
Electric Field ◽  
Boundary Value Problem ◽  
Spray Pyrolysis ◽  
Absorption Spectra ◽  
Boundary Value ◽  
Ir Absorption ◽  
Analytical Expression ◽  
Ir Absorption Spectra ◽  
Coated Spheres

An analytical expression has been obtained for the average dielectric constant of a sample consisting of small coated spheres interspersed in a matrix, by solving the static boundary value problem and averaging the values of the electric field and polarization over the whole of the sample. Absorption IR data of MgO and NiO samples of this kind, produced by spray pyrolysis, embedded in a KBr matrix, are presented, and the theory developed is employed to fit the observed spectra.

Near-IR Absorption Spectra for the Buckminsterfullerene Anions: An Experimental and Theoretical Study

1992 ◽  
Author(s):  
Del R. Lawson ◽  
Daniel L. Feldheim ◽  
Colby A. Foss ◽  
Peter K. Dorhoug ◽  
C. M. Elliott
Keyword(s):  
Absorption Spectra ◽  
Theoretical Study ◽  
Ir Absorption ◽  
Near Ir ◽  
Ir Absorption Spectra

Study of the Infrared Absorption Spectra of Some Pyridine Derivatives-Iodine Complexes

1976 ◽  
Vol 30 (2) ◽  
pp. 200-204 ◽  
Author(s):  
F. M. Abdel Kerim ◽  
F. Abou El Fotouh
Keyword(s):  
Complex Formation ◽  
Absorption Spectra ◽  
Infrared Absorption ◽  
Ir Absorption ◽  
Pyridine Derivatives ◽  
Thermodynamic Constants ◽  
Ir Absorption Spectra ◽  
Infrared Absorption Spectra ◽  
The Stability ◽  
Iodine Complexes

The ir absorption spectra of some pyridine derivatives-iodine complexes were measured in the region 400 to 1400 cm−1 and the results are discussed. The effect of complex formation on the intensities of some of the bands was investigated. The thermodynamic constants of these complexes were calculated. It was found that the stability of the complex depends to a large extent on the electronegativity as well as the position of the substituent on the pyridine nucleus. The structures of formed complexes are discussed.

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