Hannover 2013 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 16: Photoionization

A 16.5: Vortrag

Dienstag, 19. März 2013, 12:00–12:15, F 428

Angular distribution of electrons emitted in photoionization with twisted photons — •Oliver Matula^1,2, Armen Hayrapetyan¹, Stephan Fritzsche^2,3, and Andrey Surzhykov^1,2 — ¹Physikalisches Institut, Universität Heidelberg, D-69120 Heidelberg, Germany — ²GSI Helmholtzzentrum für Schwerionenforschung, D-64291 Darmstadt, Germany — ³FIAS Frankfurt Institute for Advanced Studies, D-60438 Frankfurt am Main, Germany

Photoionization of atoms and ions has been studied intensively in the last decades for various different charge states and photon energies, both in experiment and theory [1]. Apart from total ionization cross sections, much attention has been paid to the angular distribution of the emitted photoelectrons. So far, however, these angle-differential investigations dealt only with the spin degree of freedom of the incoming photons and outgoing photoelectrons. Recent advances in photo-optics allow nowadays to control not only the spin (polarization) of photon beams but also their orbital angular momentum (so-called twisted photons) [2]. In this contribution we perform a theoretical analysis of the angular distribution of electrons emitted in photoionization of hydrogen-like ions with (twisted) Bessel beams. Special attention is paid to the dependence of the electron distribution on the photon-ion impact parameter. Detailed computations and results are presented for photoionization of atomic hydrogen and hydrogen-like carbon and argon for a range of different impact parameters.

[1] J. Eichler et al., Phys. Rep. 439, 1 (2009).

[2] G. Molina-Terriza et al., Nature Phys. 3, 305 (2007).