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The pseudoperturbative shifted- l expansion technique (PSLET) is generalized for states with an arbitrary number of nodal zeros. Bound-states energy eigenvalues for two truncated Coulombic potentials are calculated using PSLET. In contrast with the shifted large- N expansion technique, PSLET results compare excellently with those from a direct numerical integration.
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Odeh et al. (2000) studied this question.
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