Abstract
A study is made of the collisional-collisional pumping of masers based on rotational transitions of H/sub 2/O (CCr). The data in the literature (determined by various methods) on the probabilities of transitions in collisions of H/sub 2/O with H/sub 2/ and electrons are used. It is shown that at degrees of ionization /eta/ > 5 x 10/sup /minus/5/ and when the hydrogen temperature (T/sub H/) is higher than the electron temperature (T/sub e/) the CCr pumping has a stable (with respect to the choice of the collision model) tendency to invert the 6/sub 16/-5/sub 23/ transition, giving the observed maser line at 1.35 cm. For the opposite relationship between the temperatures (T/sub H/ < T/sub e/), inversion of the 6/sub 16/-5/sub 23/ transition is possible only in a narrow range of /eta/ (near /eta/ = 10/sup /minus/5/) and only for a definite collision model. The transitions 6/sub 25/-5/sub 32/ (lambda = 0.23 mm) and 7/sub 34/-6/sub 43/ (lambda = 0.12 mm) are also inverted stably by the CCr pumping mechanism, but in a narrower range of /eta/.
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