Ionization of atoms and molecules by antiproton impact

During the decade that the LEAR accelerator at CERN has existed, the PS194 collaboration has obtained a substantial amount of experimental data for the ionization of atoms and molecules by antiproton impact. Here, we present a few of the most important and recent results, compare them to newly developed theory, and point out the progress that has been achieved for our understanding of ionization in few-body systems because of this information, as well as some remaining problems. PS194 collaboration at CERN This revised version was published online in August 2006 with corrections to the Cover Date.