THE INFRARED ABSORPTION SPECTRA OF DEUTERATED ESTERS: II. ETHYL ACETATE

1956 ◽  
Vol 34 (10) ◽  
pp. 1392-1404 ◽  
Author(s):  
B. Nolin ◽  
R. Norman Jones
Keyword(s):  
Absorption Spectrum ◽  
Ethyl Acetate ◽  
Absorption Spectra ◽  
Infrared Absorption ◽  
Infrared Absorption Spectrum ◽  
Absorption Characteristic ◽  
Stretching Vibration ◽  
Methylene Groups ◽  
Infrared Absorption Spectra ◽  
The Individual

The infrared absorption spectrum of ethyl acetate has been compared with the spectra of seven derivatives deuterated in the methyl and methylene groups. In the region 3500–1300 cm.−1 most of the bands can be assigned to vibrations localized in the individual groups. Absorption characteristic of the trideuteromethyl and dideuteromethylene groups can be recognized between 2300 and 2000 cm.−1. The C=O stretching vibration shows progressive displacement to lower frequency with increasing deuteration. The spectra in the range 1300–700 cm.−1 are also reported.

THE INFRARED ABSORPTION SPECTRA OF DEUTERATED ESTERS: I. METHYL ACETATE

1956 ◽  
Vol 34 (10) ◽  
pp. 1382-1391 ◽  
Author(s):  
B. Nolin ◽  
R. Norman Jones
Keyword(s):  
Absorption Spectrum ◽  
Absorption Spectra ◽  
Infrared Absorption ◽  
Methyl Acetate ◽  
Infrared Absorption Spectrum ◽  
Methyl Groups ◽  
Deuterium Substitution ◽  
Infrared Absorption Spectra ◽  
The Individual

By comparison of the infrared absorption spectrum of methyl acetate with the spectra of three deuterium substitution products, it has been possible to assign the bands in the 3100–2800 cm.−1 and 1500–1300 cm.−1 regions of methyl acetate to vibrations localized in the individual methyl groups. Bands characteristic of the individual trideuteromethyl groups are also identified between 2300 and 2000 cm.−1. The C=O stretching frequency is observed to shift to lower frequency with increasing deuteration. The spectra in the range 1300–700 cm.−1 are also reported.

Investigation on the Infrared Absorption Spectrum of Pearl and Nacre

2012 ◽  
Vol 528 ◽  
pp. 156-159 ◽  
Author(s):  
Cun You Huang ◽  
Qing Xiang Chen ◽  
Zheng Ye Xiong ◽  
Yu Jun Feng ◽  
Yong Qiang Li ◽  
...  
Keyword(s):  
Composite Material ◽  
Absorption Spectrum ◽  
Calcium Carbonate ◽  
Absorption Spectra ◽  
Infrared Absorption ◽  
Infrared Absorption Spectrum ◽  
Infrared Absorption Spectra

The infrared absorption spectra of some saltwater pearl and shell are investigated; the micrographs of the pearl and nacre layer are viewed. The result shows that infrared absorption spectra of pearl and nacre comprise the spectra of nanophase CaCO3 and other unidentified material, this can evidence that nacre is a kind of biologic composite material composed of nanophase calcium carbonate.

THE INFRARED ABSORPTION SPECTRA OF DEUTERATED ESTERS: III. METHYL LAURATE

1962 ◽  
Vol 40 (2) ◽  
pp. 301-320 ◽  
Author(s):  
R. Norman Jones
Keyword(s):  
Absorption Spectrum ◽  
Infrared Absorption ◽  
Carbon Disulphide ◽  
Infrared Absorption Spectrum ◽  
Methyl Laurate ◽  
Methyl Groups ◽  
Acid Chlorides ◽  
Methyl Group ◽  
Methylene Groups ◽  
Infrared Absorption Spectra

The infrared absorption spectrum of methyl laurate in carbon tetrachloride and carbon disulphide solutions has been compared with the spectra of seven derivatives deuterated in the ω-methyl group, the α-methylene groups, the carbomethoxy group, and in binary and ternary combinations of these positions. The spectra of n-dodecanes deuterated in the terminal methyl groups and of methyl laurates chlorinated in the ω-methyl and α-methylene groups have also been measured.From an analysis of these spectra, all the bands and inflections between 3100 and 700 cm−1 in the spectrum of methyl laurate can be assigned to localized group vibrations. The spectra of some related acid chlorides, alcohols, and bromides are also briefly noted.

Measurement and Analysis of near Infrared Spectrum of Gasoline Vapor

2012 ◽  
Vol 571 ◽  
pp. 243-247
Author(s):  
Li Ping Yan ◽  
Shu Li ◽  
Lai Gen Luo ◽  
Min Zhang ◽  
Jing Xin Dong
Keyword(s):  
Absorption Spectrum ◽  
Infrared Spectrum ◽  
Infrared Absorption ◽  
Near Infrared ◽  
Detection System ◽  
Infrared Absorption Spectrum ◽  
Vapor Concentration ◽  
Absorption Characteristic ◽  
Gasoline Vapor ◽  
Near Infrared Spectrum

In the fiber-sensing gas detection system, characteristic of near infrared absorption spectrum of the detected gas is greatly significant. The volatilized gasoline vapor is a mixture rich in various components, of which near infrared absorption spectrum shall be determined by means of experimental measurement. In this paper, an experimental platform is constructed by analyzing absorption characteristic of liquid composition in gasoline within the range of near infrared spectrum, which achieves measurement of the volatilized gasoline vapor with different concentration. In addition, reliability of this measurement method is inspected, a comparison between features of absorption spectrograms of liquid and gas is made, and linear relation of absorbance and concentration of gasoline vapor is verified. The result shows that the experimental data is acceptable and may be used as the basis of further analysis and for design of the online detecting system of gasoline vapor concentration in the hazardous environment.

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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