Absolute excitation cross sections for the 41S-, 41D- and 31P-levels of helium excited by fast protons
We have measured absolute cross sections for proton excitation of the 31P-,41S- and 41D-levels of He in the energy range from 200 keV to 1 MeV. Calibration with a tungsten lamp mounted in the collision chamber and normalization on the high energy first Born approximation 31P values for protons and electrons were used to obtain absolute data. At 1 MeV the experimental results agree within 10% with the first Born approximation values.
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