The nonrelativistic Coulomb–Born approximation has been used to compute scaled collision strengths for electron impact excitation of the 1s → ns, np, nd transitions in hydrogenic ions. Results are given for n = 2, 3, 4, 5, 6, [Formula: see text] as a function of the incident electron energy in threshold units. Simple formulae for interpolating the tabulated results are also given.
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J. A. Tully (1973) studied this question.