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TrapREMI - Development of a Reaction Microscope inside a Zajfman Trap and First Photodissociation Experiments on Stored Molecular Ions

Schotsch, Frans-Felix

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Within this thesis, a new experimental setup has been developed to investigate the quantum dynamics of molecular ions and charged clusters. An Electrostatic Ion Beam Trap (EIBT) stores a fast target beam at keV energies in oscillatory motion. By crossing it with a projectile beam, e.g. an IR laser, molecular reactions can be induced. We implemented a Reaction Microscope (REMI) in the field-free region of the EIBT to perform coincidence spectroscopy on the resulting reaction products. In contrast to prior experiments, this unique combination of techniques allows to measure the 3D momentum vectors of ions, electrons and neutrals as reaction products in coincidence. At the same time, the EIBT allows for advanced target preparation techniques, e.g. relaxation of hot molecules during storage times up to seconds, autoresonance cooling and recycling of target species which are difficult to prepare. The TrapREMI setup can be connected to a variety of projectile sources, e.g. atomic gas jets, large-scale radiation facilities and ultrashort laser pulses which enable even time-resolved studies. Here, we describe the setup development and first, IR-induced photodissociation experiments on O2+ and CH4+, providing a proof-of-principle for ion-neutral coincidence detection in the TrapREMI.

Document type: Dissertation
Supervisor: Moshammer, Priv.-Doz. Dr. Robert
Place of Publication: Heidelberg
Date of thesis defense: 9 December 2020
Date Deposited: 19 Feb 2021 14:49
Date: 2021
Faculties / Institutes: The Faculty of Physics and Astronomy > Dekanat der Fakultät für Physik und Astronomie
Service facilities > Graduiertenschulen > Graduiertenschule Fundamentale Physik (HGSFP)
Service facilities > Max-Planck-Institute allgemein > MPI for Nuclear Physics
DDC-classification: 530 Physics
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