In relativistic ion-atom collisions electron transfer processes have been at the centre of attention for a variety of reasons, not the least because they are a basic ingredient in relativistic ion accelerator design [1, 2]. Among these transfer processes the electron loss to the projectile continuum appearing as a 0 0-cusp (ELC) merits special consideration. It permits to study in high resolution the dynamics of the ionization for well defined shells of highly charged ionic projectiles with emphasis focusing on continuum states very close to threshold. This provides very sensitive tests of first order theories  and has recently received new attention . We have studied forward electron emission in two systems with different projectile Compton profile: U 88+ + N2 and Sn 47+ + N2 collisions at the supersonic jet-target of the ESR storage ring and report first results for 90AMeV Belike U 88+ and 300AMeV Li-like Sn 47+. The ELC is identified by measuring coincidences between electrons around ve≈vProj and charge-exchanged projectiles having lost one electron (see Fig 1). Electrons were analyzed with the imaging forward electron spectrometer. d σ/dp (arb units
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