8: The Variational Principle Last updated Sep 18, 2020 Save as PDF 7.5: Electronic States of the H₂ Molecule 8.1: Approximate Solution of the Schrödinger Equation Page ID28794 Graeme AcklandUniversity of Edinburgh ( \newcommand{\kernel}{\mathrm{null}\,}\) 8.1: Approximate Solution of the Schrödinger Equation8.2: Excited States8.3: Analytic example of variational method - Binding of the deuteron8.4: Quantum forces - the Hellmann-Feynman Theorem8.5: An aside about Kinetic Energy8.6: Variational Method in MAPLE8.7: Density functional theory (Nobel prize 1998)8.8: Kohn-Sham functional