Transverse Momentum Transfer in Atom-Light Scattering
  We predict a photon Hall effect in the optical cross-section of atomic hydrogen, which is caused by the interference between an electric quadrupole transition and an electric dipole transition from the ground state to $3D_{3/2}$ and $3P_{3/2}$. This induces a magneto-transverse acceleration comparable to a fraction of $g$. In atoms with a two level electric dipole transition, a much smaller transverse force is generated only when the atom is moving. 
Bart Van Tiggelen (LPMMC), Geert L. J. A. Rikken (LNCMI, LNCMI),   Andreas Nussle (LPMMC)
physics.optics physics.atom-ph