New spectroscopic knowledge of the ν1+ν4 R(2) E line of methane over the temperature range 77–300K is reported. Theoretical calculations of the absorption coefficient and the amplitudes of saturated dispersion resonances at 4234cm−1 were derived. The theoretical dependence on the temperature of the amplitudes of the saturated dispersion resonances was obtained. A novel setup based on a Cr2+:ZnSe laser was used for Doppler-free spectroscopy of methane. The amplitudes of the saturated dispersion resonances of the ν1+ν4 R(2) E line of methane were measured experimentally at different temperatures. A comparison with theoretical dependence supports the reliability of the experiment. The obtained results are of immediate interest in applications demanding laser frequency stabilization.
Journal of Quantitative Spectroscopy & Radiative Transfer – Elsevier
Published: Jul 1, 2016
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