Abstract
Selection rules are analyzed for vibration-rotation radiative transitions. Within the framework of the harmonic model for atomic oscillations the selection rule corresponds to a change of the vibrational number by one in radiative transitions, whereas rotational number may be conserved or be changed by one in vibrational-rotational transitions. The expression is presented for the absorption coefficient as a result of radiative vibrational-rotational transitions in diatomic molecules, as well as the expression for the spectral line intensity. The absorption coefficient is obtained for radiative vibrational-rotational transitions in atmospheres of the Earth and Venus due to atmospheric carbon dioxide molecules.
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