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A procedure has been developed for preparation of clean surfaces of oxide superconductors for study by electron spectroscopy. This involves annealing ceramic or thin film samples under an oxygen atmosphere in a preparation chamber that is an integral part of the spectrometer UHV system. The technique has allowed us to obtain high quality spectroscopic data from YBa,Cu,O,-,doi:10.1088/0953-2048/3/1/003 fatcat:jswqsvlihbezvcaphqpnlexg4m