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MO: Fachverband Molekülphysik
MO 19: Poster 3
MO 19.3: Poster
Thursday, March 17, 2022, 16:30–18:30, P
High resolution photoelectron spectroscopy on deeply cold niobium and tantalum clusters — •Fabian Bär, Moritz Weigt, and Bernd v. Issendorff — Physikalisches Institut der Albert-Ludwigs-Universität Freiburg
The properties of deeply cold niobium clusters Nb9− to Nb30− and tantalum clusters Ta5− to Ta22− at 3.9K have been investigated.
In combination with a time-dependent potential applied to the flight tube, our magnetic bottle time-of-flight photoelectron spectrometer has a current resolution of Δ E/E = 0.37% [1]. This is at least a factor five better than a standard magnetic bottle spectrometer and still competitive with a hemispherical energy analyzer whose drawback is a significantly worse collection efficiency. Combining the improved spectrometer with a low-jitter, short-pulse excimer laser operating at 157nm, we gain access to bound states down to 7.9eV at a so far unreached precision in such a setup [2].
In this configuration we recorded more detailed photoelectron spectra for small niobium and tantalum clusters cooled down to their vibrational ground state.
[1] M.Weigt, PhD thesis, Albert-Ludwigs-Universität Freiburg (2021).
[2] O.Kostko, PhD thesis, Albert-Ludwigs-Universität Freiburg (2007).