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1. Quantum Chemistry

   Linked via "electron-electron repulsion"

   The Schrödinger Equation and Approximations
   The fundamental equation governing the system is the time-independent, non-relativistic Schrödinger equation. For a collection of nuclei and electrons, the Hamiltonian operator ($\hat{H}$) includes kinetic energy terms for both nuclei and electrons, and potential energy terms describing electron-electron repulsion, [nucleus-nucleus repulsi…

2. Quantum Chemistry

   Linked via "electron-electron repulsion"

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   Solving this equation exactly is impossible for any system containing more than one electron due to the complexity of the electron-electron repulsion term.
   The Born-Oppenheimer Approximation