Ig. Young et Ph. Norrington, SOLUTION OF THE RELATIVISTIC ASYMPTOTIC EQUATIONS IN ELECTRON-ION SCATTERING, Computer physics communications, 83(2-3), 1994, pp. 215-226
Two asymptotic expansions are suggested for the solution of the couple
d equations for the radial channel wavefunctions arising from the trea
tment of electron-ion scattering using the Dirac Hamiltonian. The recu
rrence relations obtained for the expansion coefficients are given. A
method is suggested for calculation of the one-electron Dirac-Coulomb
functions used in the second expansion using solutions of the non-rela
tivistic Coulomb equation with complex arguments.