Broadening and shift of the methane absorption lines in the 11000-11400 cm-1 region
V.I. Serdyukov, L.N. Sinitsa, A.D. Bykov, A.P. Shcherbakov
V.E. Zuev Institute of Atmospheric Optics of Siberian Branch of the Russian Academy of Science, 1, Academician Zuev square, Tomsk, 634021, Russia
Keywords: метан, фурье-спектрометр, поглощение, интенсивность, полуширина, сдвиг линии, methane, Fourier spectrometer, absorption, line strength, halfwidth, line shift
Abstract
Absorption spectra of methane in the 11000-11400 cm-1 region were recorded at a IFS-125M Fourier spectrometer at pressures from 11 to 100 mbar, room temperature, and spectral resolution of 0.03 cm-1. A multipass cell 60 cm long and 44 passes were used, which provided a total path length of 2640 cm and threshold sensitivity to absorption on an order of 10-8 cm-1. Voight contour parameters (line center, intensity, self-broadening and self-shift coefficients) were determined.
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