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MO: Fachverband Molekülphysik
MO 4: Electronic Spectroscopy
MO 4.7: Vortrag
Montag, 11. März 2019, 12:15–12:30, S HS 002 Biologie
Photo-dissociation of size and charge-state selected poly-anionic tin clusters — •Markus Wolfram, Steffi Bandelow, Alexander Jankowski, Stephan König, Gerrit Marx, and Lutz Schweikhard — Felix-Hausdorff-Straße 6, Institut für Physik, Greifswald, Deutschland
In contrast to various other metals that dissociate by monomer evaporation [1, 2], excited tin clusters offer a broad range of decay products, as observed after electron-cluster interactions [3]. To get further insight into their decay pathways, size and charge-state selected clusters Snn1−/2− were photo-excited at the ClusterTrap-setup [4] by 532-nm Nd:YAG laser pulses.
For small mono-anionic precursor clusters containing up to about n = 50 atoms, Snn−71−, Snn−101− or Snn−151− are observed as preferred fragments. For the bigger clusters (between ca. n = 50 to 70) there is a transition to monomer evaporation. In the case of di-anionic precursors, clusters Snn−101− come along with Sn101−, probably due to fission as in the case of the group-14 neighbor-element lead [5]. Furthermore, doubly charged fragment clusters as Snn−72− appear - a special feature not observed previously for di-anionic clusters.
[1] L. Schweikhard et al.,Eur. Phys. J. D 36, 179 (2005)
[2] A. Herlert et al., Int. J. MassSpectrom. 249-250,215 (2006)
[3] S. König et al., Eur. Phys. J. D 72, 153 (2018)
[4] F. Martinez et al., Int. J. Mass Spectrom. 365-366, 266 (2014)
[5] S. König et al., Phys. Rev. Lett. 120, 163001 (2018)