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Title:SPECTROSCOPIC SIGNATURES OF HHen+ (n=2−6)
Author(s):Schlemmer, Stephan
Contributor(s):Asvany, Oskar ; Császár, Attila ; Szidarovszky, Tamás ; Kohguchi, Hiroshi ; Töpfer, Matthias
Subject(s):Mini-symposium: Precision Spectroscopy for Fundamental Physics
Abstract:The combination of cryogenic ion trap machines, operated close to 4~K, with different laser sources allowed the first experimental characterization of the antisymmetric stretch ($\nu_3$) and bending ($\nu_2$) fundamentals of the linear He--H$^+$--He core of the HHe$_n^+$ complexes for $n=3-6$. The found band origins, at around 1290~cm$^{-1}$ for $\nu_3$ and around 850~cm$^{-1}$ for $\nu_2$, are fully supported by first-principles quantum-chemical computations. These results are consistent with the structure for HHe$_3^+$ being of T-shaped C$_{2v}$ symmetry and HHe$_6^+$ being of D$_{4h}$ symmetry, while HHe$_4^+$ is suggested to exhibit interesting dynamical phenomena related to large-amplitude motion. Very recently, using a quantum cascade laser, the linear HHe$_2^+$ has been probed in high resolution, yielding molecular parameters for this fundamental three-nucleus-four-electron system for the first time.
Issue Date:23-Jun-20
Publisher:International Symposium on Molecular Spectroscopy
Citation Info:APS
Genre:CONFERENCE PAPER/PRESENTATION
Type:Text
Language:English
URI:http://hdl.handle.net/2142/107467
Date Available in IDEALS:2020-06-26


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