POLARIZATION SPECTROSCOPY OF CHARGE TRANSFER PROCESSES IN COLLISIONS OF HELIUM-LIKE IONS WITH NEUTRAL GASES T. Hayakawa, C. Verzani^*, H. Watanabe^#, H. Tanuma, and N. Kobayashi Department of Physics, Tokyo Metropolitan University, Tokyo 192-0397, Japan ^* Department of Physics, Kansas State University, KS 66506, USA ^#Cooled Trapped Ions Project, JST, Tokyo 182-0024, Japan We have measured the degree of polarization of the emission line corresponding to the 1s23s - 1s23p transition of Li-like ions produced by the single electron capture of He-like oxygen ions from He and H2 between 60 keV and 120 keV. Measured degrees of polarization show different collision energy dependence due to different capture and cascade mechanism.