Erlangen 2022 – scientific programme
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MO: Fachverband Molekülphysik
MO 19: Poster 3
MO 19.18: Poster
Thursday, March 17, 2022, 16:30–18:30, P
Preparations for experiments with triatomic hydrogen ions at the Cryogenic Storage Ring — •Aigars Znotins1, Annika Oetjens1, Florian Grussie1, Damian Mull1, Oldrich Novotny1, Felix Nuesslein1, Andreas Wolf1, Arnaud Dochain2, Xavier Urbain2, and Holger Kreckel1 — 1Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Germany — 2Institute of Condensed Matter and Nanoscience, Louvain-la-Neuve B-1348, Belgium
The triatomic hydrogen ion H3+ is considered a key species in astrochemistry. It serves as a benchmark system for theoretical calculations of small polyatomic molecules and has been identified as one of the main drivers of an active interstellar ion-neutral chemistry network, contributing to the formation of complex molecules in space. Additionally, electron recombination of H3+ has received a lot of attention, owing to the influence of its rate coefficient on the ionization balance of interstellar chemistry networks. Here, we report current efforts to understand the cooling behavior of H3+ and H2D+ inside the Cryogenic Storage Ring, and the preparation of laser diagnostic schemes and dedicated ion sources for future studies. We explore the feasibility of using multi-color action spectroscopy of cold H3+ ions to probe excited states in the energy region above 20000 cm−1.
As the use of a rotationally cold ion source is a crucial component of the foreseen studies, we present the design and characteristics of a pulsed supersonic expansion source to produce molecular ion beams with low rotational temperatures.