Continuum electrons are produced in a specific l state with high-energy resolution using shake-off photoionization. This process is well characterized, so that the photoionization signal is an accurate measurement of the difference between the continuum electrons wave-function phase and that produced by a hydrogenic interaction. Measurements are reported showing the phase of a Ba++e- in a d wave, in cases where it is well behaved, and in cases where doubly excited resonances produce rapid phase variations.
J. G. Story and W. E. Cooke, "Shake-Off Measurements of Electron-Ion-Scattering Phase Shifts," Physical Review A, vol. 39, no. 9, pp. 4610-4614, American Physical Society (APS), May 1989.
The definitive version is available at https://doi.org/10.1103/PhysRevA.39.4610
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© 1989 American Physical Society (APS), All rights reserved.