Analytic cross sections for collisions of H, H2, He and Li atoms and ions with atoms and molecules IV

Analytic expressions fitted to Barnett's recommended data are given for the reaction cross sections of H, H2 and He atoms and ions colliding with atoms and molecules. The reactions treated are dissociative collisions and particle interchange reactions. The analytic expressions use the semiempirical functional forms proposed by Green and McNeal and some modified forms to make it possible not only to interpolate but also to extrapolate the recommended data. (author)