Pressure broadening and pressure shift coefficients in the 2ν20 and ν1 and bands of 16O13C18O.

Details Pressure broadening and pressure shift coefficients in the 2ν20 and ν1 and bands of 16O13C18O. Pressure broadening and pressure shift coefficients in the 2ν20 and ν1 and bands of 16O13C18O.

Nov 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998jqsrt..60..771d&link_type=abstract

Journal of Quantitative Spectroscopy and Radiative Transfer, vol. 60, issue 5, pp. 771-783

Computer Science

4

Line Broadening: Molecular Processes, Line Broadening: Carbon Dioxide

Scientific paper

In this study the authors report the first measurements of the pressure broadening and the pressure - induced line shift coefficients due to air and nitrogen for 93 individual rovibrational lines, P(46) to R(46) and P(50) to R(45), respectively, belonging to the 2v20 and ν1 bands of 16O13C18O. The results were obtained by analyzing ten long path, high-resolution laboratory absorption spectra using a multispectrum nonlinear least-squares technique. Broadening due to nitrogen was about 4% larger than by air. Similar to broadening coefficients, the pressure-shift coefficients were found to be transition dependent, but different for the P- and R-branch lines with the same rotational quantum number, J. Except for a few R-branch lines, the measured shift coefficients were negative. The shift coefficients varied from +4×10-3cm-1atm-1 at 296 K to -5.6×10-3cm-1atm-1 at 296 K. Comparisons of the broadening and shift coefficients between the two bands, between the P and R branches, and between the two broadening gases are reported. No significant difference between shift coefficients of the two bands or the two broadening gases was observed. The results obtained were compared with those reported in the literature for the more abundant 12C16O2 species.

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