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Using the cold target recoil ion momentum spectroscopy (COLTRIMS) technique,we have measured the simultaneous projectile and target ionization incollisions of He$^+$ projectiles with a mixture of gaseous H$_2$ and D$_2$ foran incident projectile energy of 650 keV. Motivated by Cooper et al. [Phys.Rev. Lett. 100, 043204 (2008)], we look for differences in the ionization crosssection of the two isotopes with the highest resolution and statisticalsignificance. Contributions of the electron-electron and electron-nucleusinteractions have been clearly separated kinematically by measuring thelongitudinal and transverse momentum of the recoiling ion. We find nosignificant isotope effect in any of our momentum distributions.

Search for isotope effects in projectile and target ionization in swift He$^+$ on H$_2$ or D$_2$ collisions