scholarly journals EXPRESS: Photoacoustic Detection of Weak Absorption Bands in Infrared Spectra of Calcite

2021 ◽  
pp. 000370282110092
Author(s):  
Stephen Campbell ◽  
Marisa Dusseault ◽  
Ben Xu ◽  
Kirk Michaelian ◽  
Kristin Poduska
Keyword(s):  
Infrared Spectra ◽  
Infrared Absorption ◽  
Driving Force ◽  
Theoretical Basis ◽  
Absorption Bands ◽  
Photoacoustic Detection ◽  
Weak Absorption ◽  
Rapid Scan ◽  
Isotopic Species ◽  
New Knowledge

Photoacoustic spectroscopic (PAS) detection of infrared absorption often produces spectra with enhanced intensities for weaker peaks, enabling the detection of features due to overtones and combinations, as well as less-abundant isotopic species. To illustrate this phenomenon, we present and discuss PAS infrared spectra of calcite (CaCO<sub>3</sub>). We use linearization of rapid-scan spectra, as well as comparing step-scan and rapid-scan spectra, to demonstrate that saturation is not the driving force behind these enhanced intensities. Our results point to a new knowledge gap, since a theoretical basis for the enhancement of these weak bands has not yet been developed.

Pyrrole Studies. I. The Infrared Spectra of 2-Monosubstituted Pyrroles

1963 ◽  
Vol 16 (1) ◽  
pp. 93 ◽  
Author(s):  
RA Jones
Keyword(s):  
Infrared Spectra ◽  
Infrared Absorption ◽  
Absorption Bands ◽  
Infrared Absorption Bands

The positions and intensities of the characteristic infrared absorption bands of the nucleus are recorded and discussed for thirty-five 2-monosubstituted pyrroles.

Pyrrole studies. IX. The infrared spectra of 1-substituted pyrroles

1966 ◽  
Vol 19 (2) ◽  
pp. 289 ◽  
Author(s):  
RA Jones
Keyword(s):  
Infrared Spectra ◽  
Infrared Absorption ◽  
Absorption Bands ◽  
Substituted Pyrroles ◽  
Infrared Absorption Bands

The positions and intensities of the characteristic infrared absorption bands of the pyrrole nucleus in the region 2000-600 cm-1 of 45 1-substituted pyrroles, 2,5-dimethylpyrroles, and 3,4-dimethylpyrroles are recorded and discussed.

Characteristic Infrared Absorption Bands for Diels—Alder Quinone Adducts and Derivatives

1968 ◽  
Vol 22 (1) ◽  
pp. 54-57 ◽  
Author(s):  
G. E. Pollard
Keyword(s):  
Infrared Spectra ◽  
Infrared Absorption ◽  
Diels Alder ◽  
Double Bonds ◽  
Empirical Correlations ◽  
Absorption Bands ◽  
Infrared Absorption Bands

Extension of established correlations for carbonyl and carbon—carbon double bonds have been evolved for some Diels—Alder quinone adducts and derivatives. Some empirical correlations for novel nortricyclenic derivatives are discussed. These compounds have four possible stereoisomers and their infrared spectra provide a ready method of differentiation.

Photoacoustic Detection of Rapid-Scan Fourier Transform Infrared Spectra from Low-Surface-Area Solid Samples

1989 ◽  
Vol 43 (3) ◽  
pp. 468-473 ◽  
Author(s):  
R. O. Carter ◽  
M. C. Paputa Peck
Keyword(s):  
Fourier Transform ◽  
Infrared Spectra ◽  
High Frequency ◽  
Gas Composition ◽  
Solid Samples ◽  
Photoacoustic Detection ◽  
Rapid Scan ◽  
Sample Chamber ◽  
Absorbing Material ◽  
Background Material

We have demonstrated that the PAS cell volume, and the state of the background material as well as the interferometer mirror velocity and the cell gas composition, must be controlled when one is recording spectra of solid samples. An optically thick, totally absorbing material with a volume matching that of the sample is needed in order to properly normalize spectra of solid samples. With the proper detection bandwidth, mirror speeds of up to 0.181 cm/s can be used with helium as a transfer medium, for the cell specified. The improvement attained at high frequency by using helium can be as much as 10-fold over that obtained with air. The Helmholtz design of the cell produces a resonance at 1.4 kHz with air and 2.65 kHz with helium. These resonances are also affected by the volume and composition of the gas in the sample chamber. Thus, it is essential to select an appropriate background sample for the purpose of normalizing spectra.

CORRELATION INTERCONNECTIONS OF BIOCHEMICAL COMPOSITION OF SALIVA AND CHARACTERISTICS OF INFRARED ABSORPTION SPECTRA

2020 ◽  
Author(s):  
L Bel'skaya
Keyword(s):  
Absorption Spectra ◽  
Infrared Spectra ◽  
Infrared Absorption ◽  
Biochemical Composition ◽  
Biochemical Parameters ◽  
Biological Fluid ◽  
Human Saliva ◽  
Absorption Bands ◽  
Metabolic Characteristics ◽  
Infrared Absorption Spectra

The comparison of the characteristics of the infrared spectra (height, area of absorption bands) with the biochemical composition was carried out using the example of human saliva. Correlations of both individual absorption bands and their combinations with a number of biochemical parameters of saliva have been established. The substantiation of the revealed regularities based on the metabolic characteristics of this biological fluid is proposed.

Quantitative interpretation of infrared absorption bands from hexagonal, cubic and mixed boron nitride films

1998 ◽  
Vol 7 (11-12) ◽  
pp. 1657-1662 ◽  
Author(s):  
M.A. Djouadi ◽  
S. Ilias ◽  
D. Bouchier ◽  
J. Pascallon ◽  
G. Sené ◽  
...  
Keyword(s):  
Boron Nitride ◽  
Infrared Absorption ◽  
Quantitative Interpretation ◽  
Absorption Bands ◽  
Boron Nitride Films ◽  
Infrared Absorption Bands

New infrared absorption bands of cesium vapor

1980 ◽  
Vol 72 (4) ◽  
pp. 2356-2363 ◽  
Author(s):  
E. Zouboulis ◽  
N. D. Bhaskar ◽  
A. Vasilakis ◽  
W. Happer
Keyword(s):  
Infrared Absorption ◽  
Cesium Vapor ◽  
Absorption Bands ◽  
Infrared Absorption Bands
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