Excitation, ionization, and electron-capture processes in slow He2++H and H++He+ collisions.

Abstract

Using the concept of hidden adiabatic energy crossings in the complex plane of internuclear distance, the collision dynamics in the system He[sup 2+]+H([ital n]), [ital n][le]4 and H[sup +]+He[sup +]([ital n]), [ital n][le]6 is studied. About 160 molecular states, coupled by 220 isolated (hidden-crossing) radial transitions and by the rotational transitions at [ital R][congruent]0 between the [ital m] states of ([ital Nl]) manifolds up to the [ital N]=10 united-atom principal quantum number, have been included in the calculations of the evolution matrix of the system. The calculated cross sections for transitions between the discrete states (excitation and electron capture), and from any of the considered discrete states to the continuum (ionization), are compared with other theoretical and experimental results where these are available.