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Relativistic electron- and proton-impact ionization of highly stripped heavy ions determined from projectile-electron loss in H2 and He.

We show that electron- and proton-impact ionization cross sections for highly stripped heavy ions can be deduced from the projectile-electron-loss cross sections determined by collisions with a H[sub 2] and a He target. We measure electron loss for 100- and 380-MeV/u Au[sup 52+], and 405-MeV/u U[sup 86+] in H[sub 2] and He targets, and extract the electron- and proton-impact ionization cross sections. Our results are compared with calculations and with channeling experiments.