Studying the state multipoles of excited atoms and ions by measuring the polarization of light emitted from the excited states is important in atomic physics. Such work yields information about: The effect of the spin dependence in ionization and/or excitation collisions Anisotropy and geometry of the excited states Collision mechanisms and electron correlation The density matrix of the system

There have been many related experiments. However, none of them has reported a measurement of a rank 6 multipole. (e,2e) measurement on Kr 1 .P. A. Hayes et al. J. Phys. B 31, L193 (1998) coincidence measurements of scattered He+ and a photon emitted from the excited Ar. The present experiment produced complement this experiment. 2 .W. Moudry et al. Phys. Rev. A 54, 4119 (1993) measuring flourescence polarization from several fine structure states excited by synchotron radiation 3 .O. Yenen. et al. Can J. Phys. 74, 955(1996)