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Interatomic Coulombic Decay in helium dimers has been measured time-resolved for the first time.

Double electron transfer in H+-H collisions is investigated using a semiclassical coupled-channel approach in which the scattering wavefunction is developed onto a two-center/two-electron atomic basis. Cross sections are presented in a wide energy domain, from 50 eV to 30 keV and exhibit a strong oscillatory behavior, in agreement with earlier measurements. Using a semi-classical model based on the relevant molecular energy curves we demonstrate that these oscillations are the signatures of interferences between direct and sequential channels leading to double capture.

On the example of the giant helium dimer, we present an efficient electronic decay process for excited atoms or molecules embedded in a chemical environment, called Interatomic (intermolecular) Coulombic decay (ICD). After simultaneous ionization and excitation of a helium atom within a helium dimer, the excited ion relaxes by ICD to He+(1s) and the neighbor neutral helium is ionized to He+(1s) as well and emits a secondary electron. A short review on ab initio methods developed during the last 10 years to accurately describe ICD is reported. Finally, the main striking results on the helium dimer obtained experimentally and theoretically are summarized.

Li3++H2 and B5++H2 collisions are investigated theoretically in a wide range of impact energy (~ 0.05 - 25 keV/a.m.u.). We present cross sections for double electron capture into autoionizing states (DCAI) of Li+ and B3+. From these cross sections, we demonstrate that Li3+ is the best candidate to perform interferometry experiments using H2 as double slits as first proposed by Barrachina and Žitnik [1].

Cross sections for double charge transfer in ion-molecule collisions are presented in the keV energy range. The results, based on a semiclassical two-electron close coupling approach, are especially focused on double capture to autoionizing states and compared, for different projectiles, to previous data, when available.

The angular differential single capture cross sections for p-He collisions have been studied, using one and two active electrons models. Discrepancies between the present one- and two-electron models, previous theoretical cross sections as well as very recent experimental data are being investigated.

Following ab initio 1D and 2D calculations by Sisourat et. al. [1] we here report full three dimensional calculations of the single ionization of an H2-molecule by a highly charged Kr+34 ion at high velocity impact (60 MeV/u). Prior theoretical investigations have all failed to account for any second order interference effects. Final results will be presented at the conference.