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We extend our treatment of the the spectroscopy and decays of thecharm-strange quarkonium system to include the effect of using the fullthree-loop QCD correction to the static short distance potential. As before,our potential model consists of the relativistic kinetic energy term, a scalarlinear confining term including its relativistic corrections and theperturbative QCD spin-dependent terms. A set of unperturbed wave functions forthe various states is obtained using a variational technique that is furtherconstrained by requiring that the wave functions also satisfy the relativisticvirial theorem. These are then used in a perturbative treatment of thepotential to fit the mass spectrum of the $c\bar{s}$ system and calculate theradiative decay widths. Our results accurately describe the $D_s$ spectrum andare compatible with the little data that is available for the radiative decaysof the $D_s$ states.

Note on predictions for $c\bar{s}$ quarkonia using a three-loop static potential