Freiburg 2024 – wissenschaftliches Programm

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MS: Fachverband Massenspektrometrie

MS 2: New Methods, Applications, Storage Rings

MS 2.5: Vortrag

Montag, 11. März 2024, 18:15–18:30, HS 3042

Photofission of dianionic tin-34 clusters — Alexander Jankowski, Paul Fischer, Moritz Grunwald-Delitz, and •Lutz Schweikhard — Inst. of Physics, Univ. of Greifswald, 17487 Greifswald

Small tin clusters (of number of atoms n below 50) are formed by building blocks of Sn₇, Sn₁₀ [1-3] and, in the case of anionic clusters, Sn₁₅ [3]. This leads to corresponding fragmentation patterns [4,5] as confirmed and further investigated [6,7] at ClusterTrap [8]. In particular, dianionic tin clusters fission into two monoanionic fragments [7], as previously found for the case of lead clusters [9]. Now, selected ensembles of Sn₃₄²⁻ clusters were irradiated by nanosecond laser pulses of variable photon energies, causing photodissociation (besides electron detachment). After a variable delay time, the remaining stored cluster ensemble is analyzed by time-of-flight mass spectrometry. The time-resolved measurements allow for the reconstruction of the decay pathways, confirming the competition of fission processes.

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[3] A. Lechtken et al., J. Chem. Phys. 132, 211102 (2010)

[4] E. Oger et al., J. Chem. Phys. 130, 124305 (2009)

[5] A. Wiesel et al., Phys. Chem. Chem. Phys. 14, 234-245 (2012)

[6] S. König et. al., Eur. Phys. J. D 72, 153 (2018)

[7] M. Wolfram et.al., Eur. Phys. J. D 74, 135 (2020)

[8] F. Martinez et al., Int. J. Mass Spectrom. 266, 365-366 (2014)

[9] S. König et. al., Phys. Rev. Lett. 120, 163001 (2018)

Keywords: Penning traps; metal clusters; photodissociation