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Approximate spectral absorption coefficients for pure rotational transitions in diatomic molecules
Affiliation:1. Institute of Natural Sciences, Graduate Program in Physics, Federal University of Pará, Belém, PA, Brazil;2. Department of Physics and Astronomy, University of Alabama, Tuscaloosa, AL, United States;3. Center of Materials for Information Technology (MINT Center) University of Alabama, Tuscaloosa, AL, United States;4. Department of Chemistry, The University of North Carolina at Chapel Hill, Murray Hall, Chapel Hill, NC, United States;5. Department of Chemistry, Federal University of São Carlos, São Carlos, SP, Brazil;6. College of Philosophy, Sciences, and Letters of Ribeirão Preto, University of São Paulo, Ribeirão Preto, SP, Brazil;7. Institute of Chemistry, Federal University of Uberlândia, Uberlândia, MG, Brazil;8. Special Academic Unit of Physics, Graduate Program in Exact and Technological Sciences, Federal University of Catalão, Catalão, Goiás, Brazil
Abstract:Approximate spectral absorption coefficients for the pure rotational spectra of diatomic molecules have been computed by using (a) the “just-overlapping line” model, and (b) a model involving smearing of the rotational structure. As has been shown previously for the infrared vibration-rotation spectra and for the electronic band spectra, the two models yield effectively identical results. Numerical data are presented for OH, CO, NO, HCl, HBr, and HF.
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