Hannover 2020 – wissenschaftliches Programm
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MO 1.1: Hauptvortrag
Montag, 9. März 2020, 11:00–11:30, f102
Infrared Spectroscopy of HHen+ and DHen+ Complexes — •Oskar Asvany and Stephan Schlemmer — I. Physikalisches Institut, Universität zu Köln, Zülpicher Str. 77, Köln
The combination of a cryogenic ion-trap machine, operated at 4.7 K, with the free-electron-laser FELIX allowed the first experimental characterization of the antisymmetric stretch (ν3) and bending (ν2) fundamentals of the linear He–X+–He (X = H, D) cores of the in situ prepared HHen+ and DHen+ complexes for n=3−6. The found band origins, at around 1290 cm−1 for ν3 and around 850 cm−1 for ν2 (for HHen+), are fully supported by first-principles quantum-chemical computations. These results are consistent with structures for the species with n=3 and 6 being of T-shaped C2v and of D4h symmetry, respectively, while the species with n=4 are suggested to exhibit interesting dynamical phenomena related to large-amplitude motions. Future high-resolution measurements will give detailed insight into the structure of these fundamental complexes.