2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/79210We describe the propagation of singularities of tempered distributional generalized eigenfunctions of many-body Hamiltonians at non-threshold energies under the assumption that the inter-particle interactions are real-valued polyhomogeneous symbols of order -1 (e.g. Coulomb-type, but without the singularity at the origin). Here the term `singularity' refers to a microlocal description of the lack of decay at infinity. We use this result to describe the wave front relation of the S-matrices. We also analyze Lagrangian properties of this relation, which shows that the relation is not `too large' in terms of its dimension.68 pages; AMS LatexAnalysis of PDEsMathematical Physics35P25 (Primary) 47A40, 58G25, 81U10 (Secondary)text