Erlangen 2018 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 33: Poster Session II
A 33.36: Poster
Mittwoch, 7. März 2018, 16:15–18:15, Redoutensaal
Excitation of hydrogen-like ions by twisted light: The effect of multipole mixing on the alignment of excited states — •Sabrina A.-L. Schulz1,2, Robert A. Müller1,2, Anton Preshkov3, and Andrey Surzhykov1,2 — 1Physikalisch-Technische Bundesanstalt, Braunschweig, Germany — 2Technische Universität Braunschweig, Germany — 3Helmholtz-Institut Jena, Germany
During the last years twisted or vortex light beams have attracted considerable attention both in experiment and theory. These beams carry a non-zero projection of orbital angular momentum (OAM) onto their propagation direction and have a helical phase front [1]. Owing to these specific features the interaction of twisted light with ions and atoms may lead to a modification of the conventional (plane-wave) selection rules of radiative transitions. Such OAM-modified selection rules were recently observed experimentally by Schmiegelow and colleagues [2]. In this contribution, we theoretically investigate how these OAM-modified selection rules affect the magnetic sublevel population of photoexcited hydrogen-like ions. Particular emphasis is paid to radiative transitions, which can occur via several multipole channels. For example, we discuss the 1s1/2 → 2p3/2 transition, which can proceed via the electric dipole (E1) and magnetic quadrupole (M2) channels. We show how the relative strength of these multipole transitions can be influenced by twisted light and how this can be seen in the magnetic sublevel population.
[1] H. M. Scholz-Marggraf, et al. Phys. Rev. A 90, 013425 (2014)
[2] C. T. Schmiegelow, et al. Nature Communications 7 12998 (2016)