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Such behavior is unusual for a metal and is explained by the relatively small width of the electron bands in that state. Many solids have lattice constants smaller than solid Xe.This results in compression of the implanted Xe to pressures that may be sufficient for its liquefaction or solidification.By additional fractional distillation, the liquid oxygen may be enriched to contain 0.1–0.2% of a krypton/xenon mixture, which is extracted either by absorption onto silica gel or by distillation.Finally, the krypton/xenon mixture may be separated into krypton and xenon by further distillation.Cullen, who successfully used it with two patients.Xenon and the other noble gases were for a long time considered to be completely chemically inert and not able to form compounds.Such non-equilibrium alignment of spins is a temporary condition, and is called hyperpolarization.The process of hyperpolarizing the xenon is called optical pumping (although the process is different from pumping a laser).

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The resulting spin polarization of xenon nuclei can surpass 50% of its maximum possible value, greatly exceeding the thermal equilibrium value dictated by paramagnetic statistics (typically 0.001% of the maximum value at room temperature, even in the strongest magnets).This was discovered in the earliest nuclear reactors built by the American Manhattan Project for plutonium production.Fortunately the designers had made provisions in the design to increase the reactor's reactivity (the number of neutrons per fission that go on to fission other atoms of nuclear fuel).It was the first time atoms had been precisely positioned on a flat surface.Solid xenon changes from face-centered cubic (fcc) to hexagonal close packed (hcp) crystal phase under pressure and begins to turn metallic at about 140 GPa, with no noticeable volume change in the hcp phase. When metallized, xenon appears sky blue because it absorbs red light and transmits other visible frequencies.

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