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MO: Fachverband Molekülphysik

MO 7: Experimental Techniques

MO 7.3: Vortrag

Montag, 11. März 2019, 14:30–14:45, S HS 002 Biologie

Poly-Anion Production of Gas-Phase Clusters — •Steffi Bandelow¹, Franklin Martinez², Stephan König¹, Gerrit Marx¹, and Lutz Schweikhard¹ — ¹Institute for Physics, University of Greifswald, 17487 Greifswald, Germany — ²Institute for Physics, University of Rostock, 18059 Rostock, Germany

While there is a long tradition in investigating cluster properties as function of the cluster size, varying the charge state opens another dimension. But especially for negative charge states, the production process often changes the cluster itself, e.g. when stabilising ligands [1-2] or deprotonation [3] are used.

In an alternative approach, size selected aluminium gas-phase clusters are stored in a Penning trap simultaneously with electrons [4-5]. After an interaction time of 1s, the clusters are analysed with respect to the maximum number of excess electrons that have been attached. For the production of higher charge states, bigger clusters are required. Using clusters with up to 1950 atoms, gas-phase systems with up to 10 surplus electrons are produced and a quadratic dependence of the appearance size on the charge state is observed. This behaviour can be explained by considering the lifetimes of the meta-stable poly-anions.

[1] M. K. Scheller et al., J. Chem. Phys. 100, 8943 (1994).

[2] X.-B. Wang et al., J. Chem. Phys. 113, 10837 (2000).

[3] S. Banerjee et al., Int J Anal Chem 2012, 282574 (2012).

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

[5] F. Martinez et al., J. Phys. Chem. C 119, 10949 (2015).