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Al K-alpha excited photoelectron spectra (X-ray photoelectron spectroscopy) of the O 1s, Cu 2p, Ca 2p, Sr 3d core levels were measured for "infinite chain" Ca2CuO3 and Ca0.5Sr0.5CuO2 compounds. The analysis indicates that for Ca2CuO3 the surface electronic structure is strongly influenced by a humid atmosphere. The surface layer is formed predominantly by copper hydroxide. The minor features of Cu 2p and O 1s are characteristic of the bulk bonding states. The valences of the Cu, Ca, and Sr atoms are close to 2+. The core electron binding energies (approximate to 934 eV peak) are due to the 2p(3/2)3d(10)L(1) configuration of Cu(II) ions in the square planar coordination for both samples.

XPS Study of "infinite Chain" Ca2CuO3and Ca0.5Sr0.5CuO2Compounds

XPS Study of "infinite Chain" Ca₂CuO₃and Ca_0.5Sr_0.5CuO₂Compounds