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Electron–photon angular correlations from the electron impact excitation of the 2s and 2p electronic configurations of atomic hydrogen

It was always anomalous that the data of Williams J F 1981 J. Phys. B: At. Mol. Phys. 14 1197 for the angular correlation parameters for an electron scattering angle of 100° for 54 eV incident electrons on atomic hydrogen were almost exactly 90° out of phase with the theoretically predicted values. This feature has been traced to a computer programming error of the coordinate system for θe ⩾ 90° in a 1977 correlations fitting program which was used only for the 2p correlations studies reported in the above paper.