The water vapor line broadening and shifting coefficients for the HDO-16 and HDO-17 lines in the 6400-7000 cm-1 spectral region induced by oxygen pressure are measured with a spectral resolution of 0.01 cm-1 at room temperature by a Fourier transform spectrometer. Measurements were carried out using Bruker IFS-125M Fourier spectrometer with a 60 cm multipath cell, with a path length of 1920 cm. The volume of the cell is 2.765 L. The absorption spectra of the HDO-16 and HDO-17 isotopologue were recorded at pressure of 23 mBar and oxygen pressures of 0, 171, 422 and 655 mBar. The difference in the broadening coefficients of the HDO-16 and HDO-17 absorption lines for the (101)–(000) band does not exceed 5%.
The water vapor line broadening and shifting coefficients for the H217O lines in the 8,550-9,164 cm-1 spectral region induced by oxygen pressure are measured with a spectral resolution of 0.01 cm-1 at room temperature by a Fourier transform spectrometer. Measurements were carried out using Bruker IFS-125M Fourier spectrometer with a 60 cm multipath cell, with a path length of 1920 cm. In order to prepare the H217O vapor, liquid water enriched to 86% with H217O produced by Sigma-Aldrich Company was used. H216O and insignificant amount of H218O make up the remaining 14% of the sample. The volume of the cell is 2.765 L. The absorption spectra of the H217O isotopologue were recorded at pressure of 23 mBar and oxygen pressures of 0, 171, 422 and 655 mBar.
The 13CH4 absorption spectra in the range between 7400 and 7600 cm-1 have been recorded at 4 temperatures from 296 K to 200 K using a Fourier transform spectrometer at pressures from 91 to 300 hPa, and at a 0.03 cm-1 spectral resolution. A 220 long cm cell was used, which provided a threshold sensitivity to absorption of the order of 10-6 cm-1. Empirical values of the lower state energy levels were derived from the intensity ratios of the lines measured at 200 K, 254 K, 296 K and 305 K. Line assignment of the ν2 +2ν3 band of the 13CH4 molecule was performed.
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