Heidelberg 2015 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 13: Collisions & Energy Transfer

MO 13.1: Hauptvortrag

Mittwoch, 25. März 2015, 11:00–11:30, PH/SR106

Cryo-stored ion beams for studying neutral production in molecular fragmentation — •Andreas Wolf — Max-Planck-Institut für Kernphysik, Heidelberg

Reactive and unimolecular fragmentation are powerful tools for probing molecular composition, structure, potential surfaces and internal dynamics. Energetic ion beams are unique in offering access to the neutral fragments, which can be efficiently detected and kinematically analyzed in coincidence measurements. In the cryogenic ion storage ring CSR [1], molecular ion beams accelerated by up to 300 kV circulate in a low-temperature and low-pressure environment suppressing collisional and radiative background interactions, while the molecules are excited or fragmented by velocity-tuned merged particle beams (electrons or atoms) or by lasers. The CSR energy is particularly suited for calorimetric single-particle fragment detection [2]. Studies on the neutral fragmentation, ranging to direct fragment-mass detection and kinetic energy release measurements, will become feasible for a wide range of complex singly-charged species, including (de-)protonated compounds, radical ions and ionic clusters. We will present the experimental method and discuss the options for complex molecules, considering in particular the interface to ion beam generation and to fragmentation detection methods. – See presentations at this meeting by [1] R. von Hahn et al. and [2] L. Gamer et al. in the session on Ion Storage Rings, Fachverband Masenspektrometrie.