Phase shifts of the static screened Coulomb potential

Phase shifts and their weighted sum over angular momentum are reconsidered for the static screened Coulomb potential (SSCP). Results are given for both an attractive and a repulsive SSCP. The numerical results are derived in the present work from two independent and simple techniques based upon the Numerov method and the variable-phase approach, respectively, applied to the Sturm-Liouville form of the Schrödinger equation. Special emphasis is given to the high-density low-temperature domain (${\lambda }_D<10\mathrm{}$ a.u.). Excellent agreement is found with results obtained previously by Rogers using the WKB approximation.