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MS: Fachverband Massenspektrometrie

MS 2: Multi-Reflection Time-of-Flight Spectrometers

MS 2.1: Talk

Wednesday, March 8, 2023, 11:00–11:15, F128

Disentangling poly-cationic fullerenes with multi-reflection time-of-flight MS — •Paul Fischer and Lutz Schweikhard — Institut für Physik, Universität Greifswald, 17487 Greifswald, Germany

Large carbon-cluster cations of size-to-charge ratios n/z≈40 to ≈ 600 are observed after laser ablation of a glassy carbon target without additional aggregation gas. Their size distribution is well described by a log-normal function, implying an underlying coalescent growth mechanic. Resolving isotopologues via multi-reflection time-of-flight mass spectrometry (MR-ToF MS) confirms the clusters to be fullerenes as well as the presence of doubly- and triply-charged species. Comparing size- and charge-state-resolved abundances with results from a statistical simulation suggests charge aggregation through ion-ion collisions during the coalescent fusion processes. This is contrary to the assumption that poly-cations are formed primarily by subsequent photoionization under these conditions.