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[en] Electron impact excitation of the 31D state of helium is studied using the electron-photon polarization correlation technique. Four Stokes parameters are determined at an incident electron energy of 29.6 eV and for scattering angles in the range 40-120o. The data are interpreted in terms of the shape and dynamics of the excited state produced over the range of kinematically defined collisions. The lack of a theoretical model to adequately describe low-energy D state excitation is exposed. (author)
Journal
Journal of Physics. B, Atomic, Molecular and Optical Physics; ISSN 0953-4075; 
; CODEN JPAPEH; v. 27(2); p. 319-328
; CODEN JPAPEH; v. 27(2); p. 319-328