Abstract
IN a recent publication Kingston, Moiseiwitsch and Skinner1 have applied the second Born approximation, retaining only terms up to the third order in the interaction energy, to the calculation of the total cross-section Q (1sā2s) for the 1sā2s excitation of hydrogen atoms by electrons. Their results are displayed in Fig. 1. Curve 1 is the cross-section obtained by using the first Born approximation while curves 4 and 6 are respectively the cross-sections given by the second Born approximation with allowance for: (a) distortion due to the coupling to the 1s and 2s states; (b) polarization due to the coupling to the 2p states as well as distortion due to the 1s and 2s states.
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MOISEIWITSCH, B. Excitation of the 2s State of Atomic Hydrogen by Electron Impact. Nature 192, 545 (1961). https://doi.org/10.1038/192545a0
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DOI: https://doi.org/10.1038/192545a0
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