Hannover 2020 – scientific programme

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MO: Fachverband Molekülphysik

MO 19: MO Poster 4

MO 19.16: Poster

Thursday, March 12, 2020, 17:00–19:00, Empore Lichthof

Towards photodissociation of cold OH⁺ in a 16-pole wire trap — •Christine Maria Lochmann, Markus Nötzold, Robert Wild, and Roland Wester — Institut für Ionenphysik und Angewandte Physik, Technikerstraße 25/3, 6020 Innsbruck, Austria

The hydroxyl cation OH⁺ plays an important role in astrochemistry. Its formation represents one of the first steps in the rich oxygen chemistry in the interstellar media, while its column density in these regions could provide a successful tracer of cosmic ray and X-ray ionization rates. The recently published photodissociation spectrum of OH⁺ provides the transition frequencies to probe the system in the UV regime [1]. Here we present our progress to probe the distribution of the rotational states of cold OH⁺ with a UV-photodissociation scheme. Analogously state-selective photodetachment spectroscopy on cold OH⁻ has been done previously in our group [2].

The experiments will be carried out in our new multipole wire trap, which can be cooled down to 6K. The trap consists of 16 wires, which can be individually addressed. Accessibility perpendicular to the trap axis allows for laser spectroscopy measurements.

[1] Hechtfischer U. et al., J. Chem. Phys. 151, 044303 (2019)

[2] Otto R. et al., Phys. Chem. Chem. Phys., 2013, 15, 612