Single- and double-electron detachment in slow collisions of H- ions with highly-charged ions

At the previous conference, HCI94 we reported the solution of the problem on double-electron detachment in collisions of H- ions with highly charged ions (HCI) at medium and large collision energies using the approach based on the non-stationary continuum-distorted-wavefunction method. At small velocities, the close-coupling based on the two-center expansion is appropriate. In the case of the ''outer'' electron removal, the two-center problem has the exact analytic solution in terms of the Coulomb Green's function. The ''inner'' electron removal is reduced to the problem of atomic hydrogen collision with the HCL The leading process is the double-electron capture into excited ionic states followed by radiative and autoionizing decay. The cross sections of single-and double-electron detachment are calculated at collision energies from 0.5-500 eV. The results are found in reasonable agreement with the experimental data available. The scaling laws are discussed.