Gregory Czap, Kyungju Noh, et al.
APS Global Physics Summit 2025
This paper shows that in copper oxide based compounds where Cu ions are in a square planar geometry with four coordination oxygen ions, i.e. CuO and Nd2CuO4, the Cu2p 3 2 (3d)10L) X-ray photoelectron core lines are narrower than in similar compounds with Cu ions in a pyramidal or octahedral geometry with five or six neighboring oxygens, i.e. Bi2Sr2CaCu2O8 and La2CuO4. To explain this difference two different charge transfer mechanisms from the oxygen p orbitals to the Cu3d orbitals are proposed. For square planar geometry (CuO4) only the px,y → dx2 - y2 charge transfer is allowed, whereas for octahedral or pyramidal geometry the additional pz → dz2 transition could take place. These two different final state configurations will produce different ionization potentials for the Cu2p 3 2 core levels. © 1992.
Gregory Czap, Kyungju Noh, et al.
APS Global Physics Summit 2025
Q.R. Huang, Ho-Cheol Kim, et al.
Macromolecules
Andreas C. Cangellaris, Karen M. Coperich, et al.
EMC 2001
R.D. Murphy, R.O. Watts
Journal of Low Temperature Physics