Abstract
The main purpose of our study is a deeper understanding of fundamental collisional dynamics at correlated transitions of electrons in many-electron transient quasimolecules formed by colliding atoms.The theory involves calculation of two-electron Quasimolecular Diabatic States (QDS) and use of multichannel models to describe the scattering problem. The potential interaction of QDS in the vicinities of their pseudocrossings are analyzed by use of the configuration interaction method.A theoretical study is made of Single - and Double-Electron Capture (SEC and DEC) by totally stripped N7+ ions from helium atoms in the collision velocity range v = 0.05 - 1 a.u. For the N7+ - He system our study has revealed the evidence of correlated DEC and it does not corroborate the mechanism of correlated DEC* as involving a virtual transition to the single-electron capture channel.
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