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All outages were of short duration. Researchers using angle-resolved photoelectron spectroscopy on Beamline 8.0.1 have reported the first quantitative experimental verification of the theoretical electronic structure of diamond. This result for diamond, a semiconductor with a relatively simple electronic structure, helps pave the way for work with more complex materials such as high-temperature superconductors. Such work leads in turn toward the design of advanced materials with custom properties. In samples with large numbers of atoms, closely spaced momentum and energy values form continuous structures called energy bands.