Rostock 2019 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 29: Cluster III (joint session MO/A)
A 29.7: Vortrag
Donnerstag, 14. März 2019, 12:15–12:30, S HS 001 Biologie
Photofragmentation of small bismuth clusters — •Paul Fischer, Gerrit Marx, and Lutz Schweikhard — Institut für Physik, Universität Greifswald, 17489 Greifswald, Germany
Bismuth clusters Bin+/− in the size range n=2 to 19 have been produced by laser ablation and stored in an electrostatic ion beam trap (EIBT) [1,2]. The trap allows the retention of size-selected ions and their separation from contaminant ions with high resolving powers [3].
Photofragmentation has been performed by use of nanosecond laser pulses (λ = 532 nm). Product patterns include multiple cluster sizes, depending on the selected precursor. To further investigate the fragmentation pathways of the clusters, parameters such as the laser-pulse energy and timing have been varied. In many cases, the preliminary data evaluation suggests pathway competition and only a few sequential decays. The size of the primary neutral fragment being evaporated shifts with increasing precursor cluster size.
[1] H. Wollnik et al., J. Mass Spectrom. Ion Processes 96(3):267-274(1990)
[2] D. Zajfman et al., Phys. Rev. A 55:R1577-R1580(1997)
[3] P. Fischer et al., Rev. Sci. Instrum. 89:015114(2018)