Lesson 38 of the Quantum Mechanics 2 Course – DFI0233 – UFPI 2021.1 on the study of the Hamiltonian for the Helium atom. Study of the Electron-Electron Interaction and the use of the variational principle to find the ground state of the Helium atom. Quantum Mechanics Playlist 1 (undergraduate level): • Curso de Mecânica Quantica 1 - Nível Gradu... Quantum Mechanics Playlist 2 (undergraduate level): • Curso de Mecânica Quantica 2 - Nível Gradu... Quantum Mechanics Playlist 1 (postgraduate level): • Curso de Mecânica Quantica 1 - Nível Pós-G... Pre-Calculus Playlist: • Curso Completo de Pré-Cálculo