Calculations for rotational population inversion in circumstellar SiO masers require collisional rates for vibrational-rotational transitions. This Letter reports quantum mechanical, state-to-state collisional rate coefficients for pure rotational and vibrational-rotational transitions among the first three vibrational stages of SiO. These are expressed in terms of simple two-parameter power-law fits accurate in the temperature range 1000-3000K.
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Bieniek et al. (1983) studied this question.