A new technique has been developed for evaluating second-order distorted-wave amplitudes for atomic excitation without making any approximations. By this technique, second-order amplitudes with arbitrary distorted waves and arbitrary Green's functions in the interaction can be evaluated with comparable difficulty. The utility of the method is demonstrated through a practical calculation of the second-order distorted-wave approximation for electron excitation of the 2p state of hydrogen.
D. H. Madison, "Full Second-Order Distorted-Wave Calculation without Approximations for Atomic Excitation by Electron Impact," Physical Review Letters, vol. 53, no. 1, pp. 42-45, American Physical Society (APS), Jul 1984.
The definitive version is available at https://doi.org/10.1103/PhysRevLett.53.42
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