Marcel Griesemer, Heribert Zenk
Asymptotic Electromagnetic Fields in Non-relativistic QED: 
the Problem of Existence Revisited
(239K, pdf)

ABSTRACT.  This paper is devoted to the scattering of photons at electrons in 
models of non-relativistic quantum mechanical particles coupled 
minimally to the soft modes of the quantized electromagnetic 
field. We prove existence of scattering states involving an 
arbitrary number of asymptotic photons of arbitrarily high energy. 
Previously, upper bounds on the photon energies seemed necessary 
in the case of $n>1$ asymptotic photons and non-confined, 
non-relativistic charged particles.