Erlangen 2022 – scientific programme
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MO: Fachverband Molekülphysik
MO 16: Ions
MO 16.1: Invited Talk
Thursday, March 17, 2022, 10:30–11:00, MO-H5
Infrared Spectroscopy of Ionic Hydrogen-Helium Complexes — •Oskar Asvany and Stephan Schlemmer — I. Physikalisches Institut, Universität zu Köln, Zülpicher Str. 77, Köln
Ionic species consisting of only hydrogen and helium, HmHen+, are of interest in astrophyics (those with small n and m) and in molecular physics (because some of them exhibit a floppy behaviour). Using a combination of cryogenic ion-trap machines, operated at 4 K, and different laser sources, the ionic species HHen+ (n=2−6), DHen+ (n=3−6), H2He+, D2He+ and H3He+ have been investigated by low- and high-resolution infrared spectroscopy. This contribution gives an overview about the investigations done in the last couple of years, with an emphasis on HHen+ (n=2−6). These species are known to consist of a linear He-H+-He (n=2) chromophore, with additional helium atoms attached to the central proton (n=3,4,..). The IR results confirm this motif, with n=3 and n=6 being of T-shaped C2v and of D4h symmetry, respectively, while the species with n=4,5 are suggested to exhibit interesting dynamical phenomena related to large-amplitude motion.