DETERMINATION OF DIPOLE MATRIX ELEMENTS AND PHASE SHIFTS FROM THE MEASURED ANGULAR DISTRIBUTIONS OF PHOTOELECTRONS FOR FIXED-IN-SPACE CO MOLECULES S.Motoki*+, J.Adachi$, Y.Hikosaka*, M.Sano*, E.Shigemasa*, K.Soejima++, A.Yagishita*, K.Ito*, G.Raseev# and N.A.Cherepkov* *Photon Factory, High Energy Accelerator Research Organization, Oho 1-1, Tsukuba-shi, 305-0801 Japan +Graduate School of Science and Technology, Chiba University, Chiba, 263-8522 Japan $ Institute of Molecular Science, Myodaiji, Okazaki 444, Japan ++Graduate School of Science and Technology, Niigata University, 8050 Ikarashi, Niigata-shi, Niigata 950-21 Japan #Laboratoire de Photophysique Molequlaire, Batiment 210-213, Universite de Paris-Sud, 91405 Orsay, France For the first time a complete photoionization experiment is performed for CO molecules in the ground state by extracting the dipole matrix elements and phase shifts for both sigma and pi final states from the measured angular distributions of photoelectrons ejected from O and C K-shells of fixed-in-space molecules. The only parameter which remains undefined is the relative phase shift between the sigma and pi final states. The results are compared with the calculations performed in the Hartree-Fock approximation.