Abstract
The authors have studied the orbital angular momentum transfer (as a function of the electron scattering angle) in the excitation of the 21P state of helium by electrons at incident electron energies of 50, 60 and 80 eV. This was done in an electron-photon coincidence experiment. At 80 eV the orbital angular momentum transferred by the electron to the atom appears to change sign at a certain scattering angle. At lower energies of 50 and 60 eV no sign reversal is observed. These results can be explained qualitatively by the semiclassical model of Steph and Golden (1980).
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