Abstract
Abstract The perturbed-rotational-state (PRS) approach introduced by Takayanagi and developed by the present author is a very powerful tool for treating low-energy ion—molecule collisions. However, all previous PRS methods are based on the semiclassical impact-parameter theory. In the present work, a quantum-mechanical PRS theory is formulated, and a preliminary application to the H+—CO collision is performed. Semiclassical impact-parameter calculations under the assumption of a straight-line trajectory are also performed, and compared with the quantum-mechanical results. The energy range studied in the calculations covers the conditions of interstellar molecular clouds.
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