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Ultra-dense hydrogen H(−1) is a quantum material and the first material which is superfluid and superconductive at room temperature. This has been shown in detail for the deuterium form D(−1). With its experimentally determined H–H bond distance of normally 2.3 ± 0.1 pm, it is up to a factor of 105 denser than hydrogen ice composed of H2 molecules. Its existence means that when hydrogen is compressed...
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