Our problem of interest is electron-atom scattering. One type of experiment is to measure the number of electrons exciting an atom from a initial s-state to a final p-state. These measurements are proportional to the differential cross section (DCS)….
The plane wave Bom approximation is known not to be accurate enough. However Lassetre claims that even if PWBA (plane wave Bom approximation) is not reliable, a more accurate theory should still extrapolate to the optical oscillator strength.
The theory we are using is significantly better than the PWBA. According to Lassetre’s theorem, our theory should extrapolate to the optical oscillator strength. The objective of this research project was to check this theory.
Chen, Hansen, "Extrapolation of the Experimental Data of Electron Scattering" (1991). Opportunities for Undergraduate Research Experience Program (OURE). 131.