Rostock 2019 – wissenschaftliches Programm

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MS: Fachverband Massenspektrometrie

MS 3: Mass Spectrometry - Posters

MS 3.3: Poster

Dienstag, 12. März 2019, 16:30–18:15, S Fobau Physik

Photoexcitation of size-selected ions in an electrostatic storage device — •Paul Fischer, Gerrit Marx, and Lutz Schweikhard — Institut für Physik, Universität Greifswald, 17489 Greifswald, Germany

An electrostatic ion beam trap (EIBT) [1] (or multi-reflection time-of-flight mass spectrometer (MR-ToF MS) [2]) has been utilized for systematic investigations of molecular photofragmentation. To this end, bismuth clusters have been produced by a laser ablation source and subsequently stored and mass-selected [3] in the trap. A pulsed laser beam (λ = 532 nm) is guided through the trap axially, the pulse timing of which is chosen to interact with the stored ion bunch at its turn-around point in the trap’s mirror potential. Simultaneously, the trap is opened to release the clusters towards an ion detector. Thus, the fragment ions leave the EIBT as individual bunches and their masses can be determined via ToF mass spectrometry. In cases where higher resolving power is needed, the opening of the mirror can be delayed to allow MR-ToF operation. This marks a novel form of use for an MR-ToF MS in the sense that the device is used both to preselect an ion species of interest and investigate its reaction products in a single measurement cycle.
[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)