Note on Resonant and Non-resonant Peaks in Electron-Atom Total Scattering Cross Sections
Thylwe Karl-Erik1, *, McCabe Patrick2
       

Comparison of the phase shifts corresponding to l = 1 (as in Fig. 2) and l = 2 and l = 3 as functions of k. The RTF potential is defined by a = 0.19, with Z = 63. For l = 3 the phase shift passes through an odd integral multiple of π / 2 in value, while for l = 1, 2 it does not.