9: Indistinguishable Particles and Exchange Last updated Sep 18, 2020 Save as PDF 8.8: Kohn-Sham functional 9.1: Introduction Page ID28801 Graeme AcklandUniversity of Edinburgh ( \newcommand{\kernel}{\mathrm{null}\,}\) 9.1: Introduction9.2: The exchange operator and Pauli’s exclusion principle9.3: Two indistinguishable particles with spin 1/29.4: The exchange interaction9.5: Spins and Exchange9.6: Wavefunction for many spin one-half particles9.7: Helium9.8: Electron-electron interaction - ground state by perturbation theory9.9: Multiplicity and Degeneracy of Excited States