We have measured the linear polarization of the 5016-, 2s S1-3p P1 transition of Hei excited by a thin carbon foil perpendicular to the incident He+ beam at ion energies 50-500 keV. We find that the alignment of the 3p P1 term depends upon the beam current density within the range (2-150 μA cm-2) measured. Oscillations in the dependence of both MI (the linear polarization fraction) upon energy and the current density variation of MI with energy are observed. We discuss possible origins of these variations.
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics