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The multiple scattering-based theory of Gaspari and Gyorffy for theelectron-ion matrix element in close packed metals is applied to Im-3m H3S,which has been predicted by Duan {\it et al.} and Bernstein {\it et al} to bethe stable phase at this stoichiometry around 190 GPa, thus is the leadingcandidate to be the phase observed to superconduct at 190K by Drozdov, Eremets,and Troyan. The nearly perfect separation of vibrational modes into those of Sand of H character provides a simplification that enables identification ofcontributions of the two atoms separately. The picture that arises is basicallythat of superconducting atomic H stabilized by strong covalent mixing with S 3pand "3d" character. The reported isotope shift is much larger than thetheoretical one,suggesting there is large anharmonicity in the H vibrations.Given the relative unimportance of sulfur, hydrides of lighter atoms atsimilarly high pressures may also lead to high temperature superconductivity.

Cubic H$_3$S around 200 GPa: an atomic hydrogen superconductor stabilized by sulfur