Electron Transfer Processes to Continuum inNear-Relativistic Ion-Atom Collisions

摘要

Theories for electron transfer to the continuum have encountered considerable difficulties to take intoaccount the intrinsic many-electron processes in the capture channel. This may partially be attributed to largemomentum transfers involved and thus collision systems are mostly not in the realm of first order perturbation theories.For this reason we have studied collision systems where simultaneously distinct competing electron transfer processesare found to be active, like radiative (RECC) and non-radiative electron capture to continuum (ECC) in the relativisticdomain where one or two even active electrons are involved; here another, though distinct, transfer process, theprojectile electron loss to continuum (ELC), permits additionally to study the dynamics of ionization very close tothreshold. We have studied these electron .transfer processes simultaneously in forward electron emission in twosystems of different projectile Compton profile, U8 S' + N2 and Sn47' + N2 collisions using the forward electronspectrometer at the supersonic jet-target of the ESR storage ring. We report first results and compare with theory.