Raman Spectrum of Methane in the Range 20–40oC

The influence of temperature in the range 20–40 o C on the main vibrational-rotational Raman bands (ν 1 , ν 2 , ν 3 , 2ν 2 , and 2ν 4 ) of methane was investigated. An increase of temperature caused the frequencies of the Q-branches to shift differently and the relative intensities of the 2ν 2 and 2...

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Bibliographic Details
Published in:Journal of applied spectroscopy 2017, Vol.84 (3), p.420-424
Main Author: Petrov, D. V.
Format: Article
Language:English
Subjects:
Analytical Chemistry
Atomic/Molecular Structure and Spectra
Methane
Natural gas
Physics
Physics and Astronomy
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Summary:The influence of temperature in the range 20–40 o C on the main vibrational-rotational Raman bands (ν 1 , ν 2 , ν 3 , 2ν 2 , and 2ν 4 ) of methane was investigated. An increase of temperature caused the frequencies of the Q-branches to shift differently and the relative intensities of the 2ν 2 and 2ν 4 overtones that were in Fermi resonance with ν 1 to decrease. A method for determining the temperature of a methane-containing gaseous medium was proposed. The impact of temperature fluctuations on results from Raman analyses of natural-gas compositions was estimated.
ISSN:0021-9037
1573-8647
DOI:10.1007/s10812-017-0486-3