SINGLE AND MULTIPLE IONIZATION OF ALUMINUM IONS BY ELECTRON IMPACT

M. Steidl$^\ast$, K. Aichele$^\ast$, U. Hartenfeller$^\ast$, D. Hathiramani$^\ast$,
M.S. Pindzola$^\sharp$, F. Scheuermann$^\ast$, M. Westermann$^\ast$ and E. Salzborn$^\ast$

$^\ast$Institut f"ur Kernphysik, Justus-Liebig-Universit"at Giessen, D-35392 Giessen, Germany
$^\sharp$ Department of Physics, Auburn University, Auburn, AL 36849, USA

Employing the crossed-beams technique, absolute cross sections for electron impact 
ionization of Al^{q+} in charge states q=1-7 (single ionization), q=1-3  (double ionization) 
and q=1-3 (triple ionization) have been measured for energies from threshold up to 
1 keV partly to 6.5 keV. Using our high resolution energy scan technique
we resolved fine 
autoionization resonances for Al^{2+} caused by electron capture with simultanous 
excitation of a 2p electron.