Day 492: Perturbation Approach to Helium

Learning Objectives

• •**Set up** the first-order perturbation calculation for helium
• •**Evaluate** the electron-electron repulsion integral ⟨1/r₁₂⟩
• •**Derive** the result $E^{(1)} = \frac{5}{4}Z$ Hartree
• •**Calculate** the total first-order energy and compare with experiment
• •**Analyze** why perturbation theory improves on zeroth order
• •**Understand** the limitations of first-order perturbation theory

Today's Schedule (7 hours)