Two‐phonon infrared absorption spectra in crystalline carbon dioxide

1973 ◽  
Vol 58 (11) ◽  
pp. 5009-5016 ◽  
Author(s):  
David A. Dows ◽  
Vincenzo Schettino
Keyword(s):  
Carbon Dioxide ◽  
Absorption Spectra ◽  
Infrared Absorption ◽  
Infrared Absorption Spectra

Near infrared absorption spectra of oxygen-18 enriched carbon dioxide

1971 ◽  
Vol 40 (2) ◽  
pp. 356-366 ◽  
Author(s):  
Ralph Oberly ◽  
K. Narahari Rao ◽  
L.H. Jones ◽  
Maxwell Goldblatt
Keyword(s):  
Carbon Dioxide ◽  
Absorption Spectra ◽  
Infrared Absorption ◽  
Near Infrared ◽  
Infrared Absorption Spectra

SYNTHESIS AND INFRARED SPECTRA OF GUANYLUREAS

1954 ◽  
Vol 32 (3) ◽  
pp. 242-248 ◽  
Author(s):  
Paul A. Boivin ◽  
W. Bridgeo ◽  
Jean L. Boivin
Keyword(s):  
Carbon Dioxide ◽  
Nitrous Oxide ◽  
Aqueous Solutions ◽  
Absorption Spectra ◽  
Infrared Spectra ◽  
Infrared Absorption ◽  
Tentative Assignment ◽  
Infrared Absorption Spectra ◽  
By Products

When 1-amidino-3-nitrourea is reacted in aqueous solutions of amines, nitrous oxide and carbon dioxide are eliminated and guanylureas are formed, together with disubstituted ureas as by-products. The infrared absorption spectra of some disubstituted ureas and nitrates of guanylureas are discussed with tentative assignment of bands to some groups.

Second order infrared absorption spectrum of carbon dioxide in the condensed phase

1982 ◽  
Vol 60 (3) ◽  
pp. 314-320 ◽  
Author(s):  
S. Umapathy ◽  
N. Krishnamurthy
Keyword(s):  
Carbon Dioxide ◽  
Absorption Spectra ◽  
Infrared Absorption ◽  
Infrared Absorption Spectrum ◽  
Second Order ◽  
Solid Carbon Dioxide ◽  
External Mode ◽  
Rigid Molecule ◽  
Infrared Absorption Spectra ◽  
Rigid Ion Model

Solid carbon dioxide crystallizes in the space group [Formula: see text] with four molecules in the primitive unit cell. In the infrared absorption spectra of solid CO2 Mannik and Allin have observed extensive second order features involving combinations of the intermolecular vibrations with the components of the Fermi doublet (ν1, 2ν2) at 88 and 150 K. In the present investigation an interpretation of these second order infrared absorption spectra is carried out employing the rigid ion model of Powell et al. in the framework of external mode formalism and Stephen's theory of the two phonon infrared absorption. Reasonable agreement is observed in the phonon branches along the symmetry directions in our rigid molecule approximation and also in the observed infrared absorption spectra.

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