## Singular Hylleraas three-electron integrals

##### Authors
Pachucki, Krzysztof
Puchalski, Mariusz
##### Description
Calculations of the leading quantum electrodynamics effects in few electron systems involve singular matrix elements of the inter-electronic distances of the form $1/r_i^3$ and $1/r_{ij}^3$. Integrals that result when the nonrelativistic wave function is represented with a Hylleraas basis representation are studied. Recursion relations for various powers of the electron coordinates and the master integrals are derived in a form suited for high precision numerical evaluations.
Comment: 20 pages, accepted for Phys. Rev. A
##### Keywords
Physics - Atomic Physics, Physics - Chemical Physics