Measurement and computations for temperature dependences of self-broadened carbon dioxide transitions in the 30012←00001 and 30013←00001 bands

Abstract:

Using a Fourier transform spectrometer setup we have measured the self-broadenedhalf width, pressure shift, and line asymmetry coefficients for transitions in the30012’00001 and 30013’00001 vibrational bands of carbon dioxide for four differenttemperatures. A total of 46 pure CO2 spectra were recorded at 0.008 and 0.009cm1resolution and at pressures varying from a few Torr to nearly an atmosphere. Theindividual spectral line profiles have been fitted by a Voigt profile and a speed-dependent Voigt profile, to which we have added dispersion profiles to account forweak line mixing. A comparison of the sets of results obtained for each band showed novibrational dependence of the broadening coefficients. The self-broadening and self-shift coefficients are compared to semiclassical calculations based on the Robert–Bonamy formalism and were found to be in good agreement. The line asymmetryresults are compared to linemixing calculations based on the Energy Corrected Sudden(ECS) and Exponential Power Gap models.

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