Abstract
Unoccupied O 2p states are observed in Bi/sub 2/Sr/sub 2/Ca/sub 1/Cu/sub 2/O/sub 8/ near the Fermi level. They show up as a spike in the O 1s absorption edge at threshold (h..nu.. = 528.2 eV). The orientation of these O 2p states is determined via optical selection rules from the polarization dependence of the absorption using single crystals. The O 2p holes are found to have at least 95% p/sub x//sub ,//sub y/ character with x,y in the superconducting a-b plane.
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