1. Measurement and computations for temperature dependences of self-broadened carbon dioxide transitions in the 30012←00001 and 30013←00001 bands
- Author
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A.L. Laraia, Robert R. Gamache, Chad Povey, Daniel Hurtmans, Adriana Predoi-Cross, R.J. Murphy, A.R.W. McKellar, W. Liu, and V. Malathy Devi
- Subjects
Voigt profile ,energy Corrected Sudden calculations ,Radiation ,Materials science ,media_common.quotation_subject ,Semiclassical physics ,Asymmetry ,Atomic and Molecular Physics, and Optics ,Fourier transform spectroscopy ,Spectral line ,Exponential function ,chemistry.chemical_compound ,Nuclear magnetic resonance ,fourier transform spectroscopy ,chemistry ,line broadening ,Torr ,temperature dependences ,Carbon dioxide ,shifting and mixing ,semi-classical calculations ,CO2 ,Atomic physics ,Spectroscopy ,media_common - Abstract
Using a Fourier transform spectrometer setup we have measured the self-broadened half width, pressure shift, and line asymmetry coefficients for transitions in the 30012’00001 and 30013’00001 vibrational bands of carbon dioxide for four different temperatures. A total of 46 pure CO2 spectra were recorded at 0.008 and 0.009 cm � 1 resolution and at pressures varying from a few Torr to nearly an atmosphere. The individual spectral line profiles have been fitted by a Voigt profile and a speeddependent Voigt profile, to which we have added dispersion profiles to account for weak line mixing. A comparison of the sets of results obtained for each band showed no vibrational dependence of the broadening coefficients. The self-broadening and selfshift coefficients are compared to semiclassical calculations based on the Robert– Bonamy formalism and were found to be in good agreement. The line asymmetry results are compared to line mixing calculations based on the Energy Corrected Sudden (ECS) and Exponential Power Gap models.
- Published
- 2010