Hannover 2020 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 53: SYCM: Contributed posters for the Symposium Hot topics in cold molecules: From laser cooling to quantum resonances
Q 53.4: Poster
Thursday, March 12, 2020, 16:30–18:30, Empore Lichthof
Feshbach resonances in half-collisions between para/ortho H2+ and He — •Karl P. Horn1, Daniel M. Reich1,2, Arthur Christianen3, Gerrit C. Groenenboom3, Ad van der Avoird3, Prerna Paliwal4, Yuval Shagam4, Nabanita Deb4, Edvardas Narevicius4, and Christiane P. Koch1,2 — 1Theoretical Physics, Universität Kassel, Germany — 2Theoretical Physics, Freie Universität Berlin, Germany — 3Theoretical Chemistry, IMM, Radboud University, Nijmegen, Netherlands — 4Department of Chemical Physics, Weizmann Institute of Science, Rehovot, Israel
Imaging the final states of cold He-H2+ half-collisions reveals significant differences in the rotational distributions when using either para or ortho H2+ as a collision partner. We provide an explanation of the observed disparity in terms of the dominating influence of Feshbach resonances in the vibrationally excited states of the two spin isomers. To this end, we numerically simulate the half-collision process, utilising a state of the art potential[1] and full coupled channels calculations[2]. We substantiate our analysis by studying the difference in behaviour under interchange of either one or both hydrogen atoms with deuterium.
[1] M. Meuwly et al., Phys. Chem. Chem. Phys., 2019,21, 24976-24983
[2] S. N. Vogels et al., Science, 350. 787-790 (2015)