Infrared Spectra in Polarized Light of Acenaphthene Crystals and Assignment of Molecular Vibrations

1963 ◽  
Vol 39 (8) ◽  
pp. 1942-1952 ◽  
Author(s):  
L. Colombo
Keyword(s):  
Infrared Spectra ◽  
Polarized Light ◽  
Molecular Vibrations

Infrared spectra in polarized light of crystalline C5H5NiNO and C5D5NiNO

1973 ◽  
Vol 29 (2) ◽  
pp. 277-284 ◽  
Author(s):  
A. Poletti ◽  
R. Cataliotti ◽  
G. Paliani
Keyword(s):  
Infrared Spectra ◽  
Polarized Light

Infrared Spectra of Organic Monolayers on Mica

1989 ◽  
Vol 43 (3) ◽  
pp. 473-476 ◽  
Author(s):  
George Carson ◽  
Steve Granick
Keyword(s):  
Optical Properties ◽  
Infrared Spectra ◽  
Polarized Light ◽  
Organic Monolayers ◽  
Monolayer Film ◽  
Organic Monolayer ◽  
Interference Fringes ◽  
Muscovite Mica

A method is described for obtaining infrared spectra of an organic monolayer film on muscovite mica. This task is normally difficult because mica is not metallic, and it has biaxial optical properties and produces large interference fringes when analyzed in transmission or reflection because of reflections off the front and back of a sheet. The method involves the transmission of parallel-polarized light, incident at the Brewster's angle, through a mica sheet that is oriented along one of its principal optical directions.

Microreflectance Infrared Study of Bis(Ethylenedithio)-Tetrathiafulvalene (BEDT-TTF or ET) Salts

1992 ◽  
Vol 46 (10) ◽  
pp. 1520-1524 ◽  
Author(s):  
John R. Ferraro ◽  
H. Hau Wang ◽  
Myung-Hwan Whangbo ◽  
Phil Stout
Keyword(s):  
Infrared Spectra ◽  
Polarized Light ◽  
Structural Disorder ◽  
Donor Molecule ◽  
Infrared Study ◽  
Unpolarized Light ◽  
Β Phase ◽  
Light Vector ◽  
Deuterium Analog

For several β- and κ-phase salts of bis(ethylenedithio)tetrathiafulvalene (BEDT-TTF or simply ET) and its deuterium analog d8-ET, microreflectance infrared spectra were obtained by employing polarized and unpolarized light, and their vibronic regions were examined. These salts exhibit a strong vibronic absorption under polarized light. The vibronic absorption of the β-phase salts has a much stronger polarization-dependency than that found for the κ-phase salts. For the β-phase salts, the optimum vibronic absorption occurs when the polarized light vector is parallel to their donor-molecule stacking direction. Among the ET salts without structural disorder, the highest C-C-H bending frequency for the superconductors is lower than ∼1320 cm−1 while that for the non-superconductors is higher than ∼1320 cm−1.

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