Distorted plane waves for the 3 body Schrodinger operator

Distorted plane waves, incoming in the free region, are constructed for gen eralized 3 body Schrodinger operators on R-N, under the assumption that the 'two-body' potential functions are rapidly decreasing. The construction yi elds the form of the complete asymptotic expansion of the plane waves at in finity away from the collision planes, and gives an explicit construction a nd geometric characterization of the singularities of the free channel scat tering matrix.