Abstract
High-pressure spectroscopic investigations carried out with diamond-anvil cells demonstrate that solid hydrogen undergoes a phase transition and changes in electronic properties near 150 GPa. An alternative interpretation has been proposed that ruby, which has been used as a pressure calibrant in such studies, is reduced by hydrogen to form aluminum metal and aluminum hydroxide, and that the resulting composite is responsible for the observed changes in optical spectra at these pressures. Direct measurements are performed and analyzed to test this hypothesis. We demonstrate that the hypothesis is inconsistent with the experimental data and that the spectral changes observed at 150 GPa are not associated with aluminum.
Published Version
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