Physics
Scientific paper
Jul 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982pthph..68..178s&link_type=abstract
Progress of Theoretical Physics, Vol. 68, No. 1, pp. 178-190
Physics
1
Scientific paper
We study rotational-vibrational pumping and rotational-vibronic pumping by nonreactive collisions. The maser molecules are assumed to be linear, symmetric-top or asymmetric-top rotators. We apply the energy-sudden approximation with respect to the rotational motion. The rates for pumping to various different rotational states are expressible in a simple form; it includes the rotational energy and a small number of overall collision rate constants rather than the set of the individual rotational-vibrational (rotational-vibronic) rate constants. For pumping to low-lying rotational states Γ ' the rates prove to be independent of Γ '. This agrees with a result obtained by Watson et al. for the special case of rotational-vibrational pumping of a linear rotator. We discuss validity of the energy-sudden approximation and modifications that are necessary for purely rotational pumping of a dipolar molecule by a charged particle.
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