The Use of Raman Spectroscopy for the Rapid Analysis of Chemical Compounds
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CTURE OF CHEMICAL COMPOUNDS, QUANTUM CHEMISTRY, SPECTROSCOPY
The Use of Raman Spectroscopy for the Rapid Analysis of Chemical Compounds I. B. Vintaykina, b, Il. S. Golyaka, b, *, Ig. S. Golyaka, A. A. Esakova, A. N. Morozova, b, and S. E. Tabalina, b aBauman
bCenter
Moscow State University, Moscow, 105005 Russia of Applied Physics, Bauman Moscow State University, Moscow, 105005 Russia *e-mail: [email protected]
Received May 15, 2019; revised September 30, 2019; accepted October 21, 2019
Abstract—The use of Raman spectroscopy for the rapid analysis of chemical substances is considered. To reduce the time of the analysis, it is proposed to use a Fourier-transform spectrometer based on a static Michelson interferometer, in which a spatial scan of the interferogram occurs. Two schemes of implementation of a model of a static Fourier-transform spectrometer are represented: with a matrix photodetector device (PD) that makes it possible to obtain better spectral resolution and with a linear PD, which is more sensitive. The Raman spectra are recorded in the spectral range of 800 to 1050 nm, which makes it possible to perform the analysis in the daytime. A laser with wavelength λ = 785 nm and power of 1.5 W is used as the source of excitation radiation. The interferograms obtained on both models of Fourier-transform spectrometers are presented; the Raman spectra of the following test substances are restored: 1,4-bis(5-phenyl-2-oxazolyl)benzene (POPOP, C24H16N2O2), stilbene (C14H12), chloroform (CHCl3), and ethanol (C2H5OH), and their correlation matrices are presented. Keywords: static Fourier-transform spectrometer, Raman spectroscopy, two-dimensional interference patterns, one-sided interferogram, sampling-free recording procedure DOI: 10.1134/S1990793120050255
INTRODUCTION Various methods of recording and analyzing the spectra of chemical substances are currently used for environmental monitoring on various objects. The most relevant methods include remote detection and identification methods: Raman scattering (RS) spectroscopy, photoluminescence, infrared (IR) spectroscopy, etc. [1–10]. Methods based on the recording luminescence and RS spectra [4–10], which make it possible to analyze substances by a preliminarily created database for the purpose of their determination or classification by the characteristic spectral features proved themselves to be good for sampling-free remote rapid analysis of substances. The advantage of the application of luminescence spectroscopy lies in the high intensity of the secondary radiation being recorded, which makes it possible to analyze substances at low concentrations and long distances. The scattering cross section of luminescence is substantially greater when compared to RS and is 10−22 cm2/molecules on average for most substances. The disadvantage of the method is its low level of selectivity. Raman spectroscopy does not have this disadvantage. The selectivity of this method makes it possible to analyze substances by spectral databases that include the scattering spectra of 80
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