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Exact solution to the Coulomb wave using the linearized phase-amplitude method
11.C.F. Fischer, T. Brage, and P. Jönsson, Computational Atomic Structure: An MCHF Approach (Institute of Physics, Bristol, 1997).
16.F. Calogero, Variable Phase Approach to Potential Scattering (Academic, New York, 1967).
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The author shows that the amplitude equation from the phase-amplitude method of calculating continuum wave functions can be linearized into a 3rd-order differential equation. Using this linearized equation, in the case of the Coulomb potential, the author also shows that the amplitude function has an analytically exact solution represented by means of an irregular confluent hypergeometric function. Furthermore, it is shown that the exact solution for the Coulomb potential reproduces the wave function for free space expressed by the spherical Bessel function. The amplitude equation for the large component of the Dirac spinor is also shown to be the linearized 3rd-order differential equation.
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