Mainz 2017 – scientific programme

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A: Fachverband Atomphysik

A 31: Poster Session III

A 31.18: Poster

Thursday, March 9, 2017, 17:00–19:00, P OG1

Electron-impact ionisation of xenon ions — •B. Michel Döhring¹, Alexander Borovik Jr.¹, Benjamin Ebinger¹, Tobias Molkentin¹, Alfred Müller², and Stefan Schippers¹ — ¹I. Physikalisches Institut, Justus-Liebig-Universität Giessen, Gießen, Deutschland — ²Institut für Atom- und Molekülphysik, Justus-Liebig-Universität Giessen, Gießen, Deutschland

Reliable atomic data are important for modelling of ionised gases in many different areas of physics, like astrophysics, plasma physics/spectroscopy and in atomic fusion research. Especially, cross sections for electron-impact ionisation of atoms and ions are required in such applications. The electron-impact ionisation process is fundamental in atomic physics. There is a new upcoming interest in xenon because it is proposed as a cooling gas in Tokamaks and as a propellant for ion micro-thrusters. Additionally, the xenon plasma can emit light in the extreme ultraviolet range and therefore it is a possible source of radiation in next-generation lithography devices.

We will present measurements of electron-impact single-ionisation cross sections of xenon ions. These data were measured at the electron-ion crossed-beams setup at the University of Giessen employing the well-known animated-crossed-beams technique [1]. We can now measure cross sections at energies up to twice the maximum accessible with our previous electron gun. The results are in good agreement with literature data. In the future the measurements will be extended to higher ion charge states like Xe²³⁺ which were out of reach before.

[1] Müller et al., J. Phys. B. 18 (1985) 2993-3009