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Any water detected spectroscopically is going to be either normal liquid or water vapour (either under normal or superheated conditions). You can't detect superionic water spectroscopically because it can only occur in the interiors of ice giants. Even high pressure, med temp ices such as Ice VIII and IX can't be detected spectroscopically because they occur in the interiors of water worlds or at the bottom of oceans on large super earths. They can only be inferred by experimentation based on theory, or if you have robust enough probes, sampled directly.
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