CHARGE CHANGING CROSS SECTIONS OF Kr^{q+} (q=3-9) COLLIDING WITH CO AT LOW ENERGIES BELOW 1 keV/amu K. Ishii, K. Okuno and N. Kobayashi Department of Physics, Tokyo Metropolitan University Minami-Ohsawa 1-1, Hachioji-shi. Tokyo 192-0397, JAPAN Single- and multiple- charge changing cross sections in collisions of Kr^{q+} ions (q = 3-9) with CO molecule have been measured in low energies ranging from 5.95*10^{-3} q to 1.19*10^{1} q eV/amu. An energy dependence and a charge dependence of charge changing cross section are discussed.