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Article Abstract
Single crystal x-ray diffraction measurements have been carried out on epsilon oxygen up to 30 GPa to examine the behavior of the constituent (O_{2})_{4} units. An isostructural phase transition is evidenced by lattice parameter and intracluster (O_{8}) distance discontinuities and clear changes in the equation of state at 18.1±0.5 GPa on compression. This transition corresponds well to the predicted collapse of the molecular magnetic moment from spin-liquid, ε_{1}, to a spinless, ε_{0}, states of the O_{8} structure. The collapse of the molecular magnetic moment has to date only been supported by spectroscopic data and, until now, has not been substantiated structurally.
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