Transfer ionization process in collision of fast protons with helium at milliradian scattering angles

Ionization dynamics of helium dimers in fast collisions with He++.

By employing the cold target recoil ion momentum spectroscopy technique, we have investigated the (He+, He+) breakup of a helium dimer (He2) caused by transfer ionization and double capture in collisions with alpha particles (E = 150  keV/u). Surprisingly, the results show a two-step process as well as a one-step process followed by electron exchange. In addition, interatomic Coulombic decay [L...

Scattering Length for Helium Atom-Diatom Collision

We present results on the scattering lengths of He–He2 and He–He2 collisions. We also study the consequence of varying the coupling constant of the atom-atom interaction.

Protons in Collision with Hydrogen Atoms: Influence of Unitarity and Multiple Scattering

Three-body integral equations when applied to collisions of protons with hydrogen atoms yield the amplitudes for direct scattering and electron exchange which automatically satisfy two-body and (if solved exactly also) three-body unitarity. As a consequence, differential cross sections (DCS) for both reactions are calculated on equal footing, and the total exchange cross section (TCS) results f...

Ionization-excitation of helium by fast charged particles.

Double ionization of helium by fast bare ion collisions

A time-dependent close-coupling method is developed to treat the double ionization of helium by fast bare ion collisions. At high incident energies, charge transfer to the projectile is quite small, so that the two-electron wavefunction remains centred on the target, subject to a time-dependent projectile interaction. A multipole expansion of the projectile–atom interaction includes monopole, d...