Abstract
An approximate expression for the critical screening parameters associated with the attractive generalized screened Coulomb potential (GSCP) is obtained by utilizing the varintional principle and the virial theorem. Subject to centain conditions, this expression is shown to represent a lower bound to the true critical screening parameters associated with the GSCP. Specific results are reported for the bound states n, l = n -- 1 of the Debye-Huckel potential and for the grouad state and first excited state of the exponential-cosine screened Coulomb potential. (auth)
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