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Laguerre polynomials, the new integrand

This means that our integral becomes I=0r21dr10r22dr2π0dcos(θ1)π0dcos(θ2)2π0dϕ12π0dϕ2exp2α(r1+r2)r12 where we have defined 1r12=1r21+r222r1r2cos(β) with cos(β)=cos(θ1)cos(θ2)+sin(θ1)sin(θ2)cos(ϕ1ϕ2))