SAMOP 2023 – scientific programme

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A: Fachverband Atomphysik

A 27: Poster III

A 27.1: Poster

Thursday, March 9, 2023, 16:30–19:00, Empore Lichthof

Single ionization of an asymmetric diatomic system by relativistic charged projectiles — •Andreas Jacob, Carsten Müller, and Alexander Voitkiv — Institut für Theoretische Physik I, Heinrich-Heine-Universität Düsseldorf

We study [1] the single ionization of a diatomic system by relativistic charged projectiles. The system is formed by two weakly bound different atomic species, A and B, with the ionization potential of A being smaller than an excitation energy in B. In such case, three ionization channels occur: (i) direct ionization of A, (ii) direct ionization of B, and (iii) two-center ionization of A. While (i) and (ii) represent the well-known mechanism of direct impact ionization of a single atom, in channel (iii) ionization of A proceeds via impact excitation of B with its subsequent relaxation in which the de-excitation energy is transmitted to A that ionizes it. We show that, close to the resonance energy, the two-center channel (iii) is so enormously strong that its contribution remains dominant even when considering a range of emission energies orders of magnitude broader than the resonance width. Furthermore, we demonstrate that relativistic effects, caused by a high collision velocity, can strongly influence the angular distribution of emitted electrons even at rather small values of the Lorentz factor.

[1] A. Jacob, C. Müller, and A. B. Voitkiv, Phys. Rev. A 103, 042804 (2021).