He^+^(1s)-He(1s^2^) electron-capture processes

It is essential to have reliable state-selective charge transfer, elastic, transport cross-sections, and the corresponding reaction rate coefficient data, especially for low collision energies. The elastic and non-radiative electron-capture processes in He+(1s)-He(1s2) collisions are investigated employing the full quantum-mechanical molecular orbital close-coupling method.

The ab initio adiabatic potentials and coupling matrix elements utilized are obtained by the multi-reference single- and double-excitation configuration interaction approach. The elastic, charge-transfer, and transport cross-sections in the energy range of 0.01-2500eV/amu and the reaction rate coefficient in the temperature range of 10-109K are computed, and good agreements are achieved compared to the available experimental and theoretical results.