Absorption of high-power infrared radiation as a result of weakly forbidden transitions in triatonic molecules

Calculations are reported of the spectra of the average probability and the density of weakly forbidden vibrational–rotational transitions characterized by |ΔK|> 1 in the bands ν₃ of O₃ and ν₁, of SO₂. Model equidistant spectra are used to analyze the contribution of weakly forbidden transitions characterized by ΔK = ± 3 to the excitation of the ν₁, vibrations of SO₂. A determination is reported of the ranges of radiation intensities in which the absorption due to weakly forbidden transitions is maximal.