Hannover 2013 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 39: Poster: Atomic systems in external fields

A 39.6: Poster

Donnerstag, 21. März 2013, 16:00–18:30, Empore Lichthof

Radiation-assisted relativistic electron vortex beams — •Armen Hayrapetyan¹, Oliver Matula^1,2, Andrey Surzhykov^1,2, and Stephan Fritzsche^2,3 — ¹Physikalisches Institut, Universität Heidelberg, D-69120 Heidelberg, Germany — ²Gesellschaft für Schwerionenforschung (GSI), D-64291, Darmstadt, Germany — ³Department of Physics, P.O., Box 3000, Fin-90014 University of Oulu, Finland

We study relativistic electron vortex beams under the impact of the field of a plane electromagnetic wave. We construct exact Bessel-beam solutions by making use of Volkov solutions for the Dirac equation. When switching off the field we show that these solutions contain the new type of free electron-Bessel beams, reported by Bliokh et al. [Phys. Rev. Lett. 107, 174802 (2011)]. We study total-angular-momentum-dependent distribution of probability density and current for nonparaxial Bessel beams as a dependence on electromagnetic field parameters, such as frequency and amplitude of vector potential. Moreover, we show that the kinetic momentum density in the Bessel-state implies that the effective mass of the twisted electron coupled to the field acquires a shift. Such beams may be of interest for experiments relating to the Compton and electron-electron scattering under impact of external fields, as well as radiative electron capture in relativistic ion-atom collisions and photoelectric effects in atomic systems.