Abstract
A high resolution fast electron energy loss spectrometer withmulti-channel energy analysis was employed. The maxima just above thethreshold 4p-1(2P1/2), which is regarded as a shape resonance,was obtained at 16.3 eV. The optically forbidden excitations of4s electron were measured for the first time, and the energy positionsare 23.75 eV (4s-15s), 25.66 eV (4s-16s/4d) and26.60 eV (4s-17s/5d).
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