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Laguerre polynomials, new integration rule: Gauss-Laguerre

Our integral is now given by I=0r21dr10r22dr2π0dcos(θ1)π0dcos(θ2)2π0dϕ12π0dϕ2exp2α(r1+r2)r12 For the angles we need to perform the integrations over θi[0,π] and ϕi[0,2π]. However, for the radial part we can now either use

  • Gauss-Legendre wth an appropriate mapping or
  • Gauss-Laguerre taking properly care of the integrands involving the r2iexp(2αri) terms.