TRANSMISSION OF HIGHLY CHARGED IONS THROUGH MICROCAPILLARIES K. Tokesi, L. Wirtz, C. Lemell, and J. Burgdorfer Institute for Theoretical Physics, Vienna University of Technology, Wiedner Hauptstr. 8-10, A-1040 Vienna, Austria We analyze the transmission of highly charged ions (HCI) through microcapillaries. The interaction of an HCI with the internal surface of the capillary is treated within the framework of dielectric response. For projectiles transmitted through a Ni capillary calculations for the impact parameter, angular distribution, and charge states of hollow ions/atoms are presented. We find the charge state fractions of transmitted projectiles in good agreement with recent experiments.