Abstract
The influence of temperature in the range 20–40oC on the main vibrational-rotational Raman bands (ν1, ν2, ν3, 2ν2, and 2ν4) of methane was investigated. An increase of temperature caused the frequencies of the Q-branches to shift differently and the relative intensities of the 2ν2 and 2ν4 overtones that were in Fermi resonance with ν1 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.
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