# Understanding Coulomb Interaction in Many-Particle Hamiltonian

Explore the treatment of Coulomb interaction in a many-particle Hamiltonian, where careful integration is crucial due to divergence issues. Learn about solving the Coulomb Hamiltonian with Slater integrals and expanding the operator on spherical harmonics for analytical solutions. Discover the significance of Coulomb repulsion, Slater integrals, and the radial and angular parts in this intricate process.

- Coulomb Interaction
- Many-Particle Hamiltonian
- Slater Integrals
- Spherical Harmonics
- Analytical Solutions

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## Presentation Transcript

**The following slides show you how to treat the Coulomb**interaction in a many particle Hamiltonian. As the Coulomb interaction diverges for the case where the two electrons have the same position one needs to be careful on how to integrate. As our basis functions are atom centered radial functions times spherical harmonics (or linear combinations thereof) we can expand the Coulomb interaction on spherical harmonics as well and treat the angular part analytical. The radial part are the Slater integrals. An excellent text book introducing this topic is Ballhausen Ligand field theory chapter 1 and 2.**Coulomb repulsion and Slater Integrals**Maurits W. Haverkort Institute for theoretical physics Heidelberg University M.W.Haverkort@thphys.uni-heidelberg.de**The Coulomb Integral is nasty: The integrant diverges at**r1=r2 Coulomb Hamiltonian: In order to create the Hamiltonian as a matrix we need to evaluate the following integral Solution by Slater: Expand the operator on Spherical Harmonics. Solve the angular part analytical and the Radial integral numerical (Slater Integrals.) Also works in solids. (Spherical Harmonics are not eigen-states, but still a valid basis set.**Coulomb interaction Slater Integrals**Expansion on renormalized Spherical Harmonics with Useful expansion because our basis functions are (close to) spherical**Coulomb interaction Slater Integrals**Integral to calculate Expansion on renormalized Spherical Harmonics**Coulomb interaction Slater Integrals**Radial part: Slater integrals Angular part: Analytical solution**Coulomb interaction Slater Integrals**Graphical representation**Coulomb interaction Slater Integrals**Triangular equations**Coulomb interaction Slater Integrals**d - electrons**Coulomb interaction Slater Integrals**f - electrons**Coulomb interaction Slater Integrals**Core (p) valence (d) interaction direct term**Coulomb interaction Slater Integrals**Core (p) valence (d) interaction exchange term