Rostock 2019 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 19: Cluster III (joint session MO/A)
MO 19.4: Vortrag
Donnerstag, 14. März 2019, 11:30–11:45, S HS 001 Biologie
Electron and photon interactions with size-selected lead clusters — Steffi Bandelow, •Alexander Jankowski, Stephan König, Gerrit Marx, Lutz Schweikhard, and Markus Wolfram — Institute for Physics, University of Greifswald, Germany
At the ClusterTrap-setup [1], the dissociation pattern of photoexcited lead cluster ions has been of interest in recent studies [2,3]. It was shown that lead transitions from a metallic [4] to a non-metallic fragmentation behavior [2] when approaching smaller cluster sizes. In further investigations, size-selected trapped negatively charged lead clusters are exposed to an electron beam. This leads to electron attachment [5,6] as well as collision-induced dissociation [6]. The resulting product ions reveal first hints of fission processes, where doubly negatively charged clusters break up into two singly charged fragments. The most prominent fragments observed are Pb101−, and Pbn−101−, where n is the precursor cluster size. This interpretation is confirmed by photodissociation studies of size- and charge-state selected dianionic lead clusters [7].
[1] F. Martinez et al., Int. J. Mass Spectrom. 365-366 (2014) 266.
[2] S. König et al., J. Phys. Chem. C 121 (2017) 10858.
[3] M. Wolfram et al., J. Phys. B: At. Mol. Opt. 51 (2018) 044005.
[4] P.J. Brucat et al., J. Chem. Phys. 84 (1986) 3078.
[5] A. Herlert et al., Phys. Scripta T80 (1999) 200.
[6] S. König et al., Int. J. Mass Spectrom. 421 (2017) 129.
[7] S. König et al., Phys. Rev. Lett. 120 (2018) 163001.