The Röntgen interaction and forces on dipoles in time-modulated optical fields
School of Physics and Astronomy, University of Glasgow,
G12 8QQ, UK
2 Institut für Theoretische Physik, Universität Innsbruck, Technikerstraße 21A, 6020 Innsbruck, Austria
a e-mail: email@example.com
Received in final form: 1 September 2017
Published online: 19 December 2017
The Röntgen term is an often neglected contribution to the interaction between an atom and an electromagnetic field in the electric dipole approximation. In this work we discuss how this interaction term leads to a difference between the kinetic and canonical momentum of an atom which, in turn, leads to surprising radiation forces acting on the atom. We use a number of examples to explore the main features of this interaction, namely forces acting against the expected dipole force or accelerations perpendicular to the beam propagation axis.
Key words: Atomic Physics
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