THREE-CENTER COULOMBIC OVER-BARRIER MODEL FOR MULTIPLE ELECTRON TRANSFER FROM HOMONUCLEAR DIATOMIC MOLECULES A. Ichimura$^1$ and T. Ohyama-Yamaguchi$^2$ $^1$Institute of Space and Astronautical Science, 3-1-1 Yoshinodai, Sagamihara 229-8510, Japan $^2$Tokyo Metropolitan College of Technology 1-10-40 Higashi-Ooi, Shinagawa, Tokyo 140-0011, Japan A three-center Coulombic over-barrier model is formulated for multiple electron transfer in collisions of slow highly charged ions with homonuclear diatomic molecules. The model is applied to N$_2$ and O$_2$ molecules. The orientation effect of molecular axis relative to the collision plane is discussed.