Hannover 2020 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 13: Clusters II (joint session MO/A)
A 13.1: Vortrag
Dienstag, 10. März 2020, 14:00–14:15, f142
Molecular Rotation in floppy Molecules: He-H3+ — Thomas Salomon1, Igor Savic2, Oskar Asvany1, Dieter Gerlich3, Ad van der Avoird4, Michael E. Harding5, Jürgen Gauss6, Filippo Lipparini7, and •Stephan Schlemmer1 — 1I. Physikalisches Institut, Universität zu Köln — 2Department of Physics, University of Novi Sad, Serbia — 3Institut für Physik, Technische Universität Chemnitz — 4Theoretical Chemistry, Radboud University Nijmegen, The Netherlands — 5Fakultät für Chemie und Biowissenschaften Karlsruher Institut für Technologie (KIT) — 6Department Chemie, Johannes Gutenberg-Universität Mainz — 7Dipartimento di Chimica e Chimica Industriale, Universita di Pisa, Italy
The ro-vibrational predissociation spectrum of He-H3+ has been recorded via the ν2 vibrational mode in a cold 22-pole ion trap. The spectrum for the bare H3+ consists of only a few ro-vibrational lines. Instead, the spectrum of the complex is very rich (∼ 465 lines) even at the low temperature (4 K) of the experiment. Part of this complexity is associated with the (almost) free internal rotation of H3+. The experimental results are compared to theoretical predictions of ro-vibrational spectra on the basis of ab initio calculations of the He-H3+ potential energy surface. The energy levels result in transitions which agree in many cases with experimental results within a few wavenumbers. In addition, an experimental energy term diagram is reconstructed from the observed transitions. The influence of the Coriolis interaction resulting from the H3+ internal rotation in a rotating He-H3+ frame will be discussed.