Hannover 2013 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 8: Spectroscopy in He-Droplets
MO 8.2: Vortrag
Montag, 18. März 2013, 16:45–17:00, F 107
Photoelectron spectroscopy on Mg embedded in heliumdroplets — •Lev Kazak, Sebastian Göde, Josef Tiggesbäumker, and Karl-Heinz Meiwes-Broer — Instiute of Physics, University of Rostock, Universitätsplatz 3, 18051 Rostock, D
Magnesium atoms embedded in superfluid helium nanodroplets have been identified to arrange themselves in a metastable network of isolated atoms [1], initially proposed by Gordon [2]. Excitation spectra in the vicinity of the atomic 3 1P10 ← 3 1S0 transition, measured via resonant two-photon ionization (R2PI), reveal a narrow peak next to the atomic resonance, irrespective of the cluster size, which suggests, that before excitation single Mg atoms are dissolved within the droplet. From the peak shift with respect to the monomer signal, an interatomic Mg-Mg distance of 10 Å has been deduced. Here we use photoelectron spectroscopy (PES) in order to map the electronic structure. Interestingly, also in photoemission simple spectra arise when more then a single atom is present, whereas almost no pickup dependence is observed. Additionally peaks which corresponds to highly excited complexes has beend found, indicating a possible relaxation of the metastable structure [3].
[ 1] A. Przystawik, S. Göde et. al., Phys.Rev.A 78, 021202 (2008)
[ 2] E.B. Gordon, J.Exp.Theor.Phys.Lett. 19, 63 (1974)
[ 3] S. Göde et. al., submitted to New Jour. Phys.