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There has been some controversy over the expression for the so-called`interaction energy' due to screening of charged particles in a plasma. Even inthe relatively simple case of weak screening, first discussed in the context ofastrophysical plasmas by Salpeter (1954), there is disagreement. In particular,Shaviv and Shaviv (1996) have claimed recently that by not consideringexplicitly in his calculation the complete screening cloud, Salpeter obtained aresult for the interaction energy between two nuclei separated by a distance$r$ which in the limit $r \to 0$ is only 2/3 the correct value. It appears thatthis claim has arisen from a fundamental misconception concerning the dynamicsof the interaction. We rectify this misconception, and show that Salpeter'sformula is indeed correct.Comment: 17 pages, no figures, AAS Latex, to appear in The Astrophysical  Journa

On Electrostatic Screening of Ions in Astrophysical Plasmas