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TrapREMI as a Tool for Investigating Ion-Atom Collisions


Zebergs,  Ilja
Division Prof. Dr. Thomas Pfeifer, MPI for Nuclear Physics, Max Planck Society;

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Zebergs, I. (2023). TrapREMI as a Tool for Investigating Ion-Atom Collisions. Master Thesis, Ruprecht-Karls-Universität, Heidelberg.

Cite as: https://hdl.handle.net/21.11116/0000-000D-F9E0-D
The TrapREMI is a setup combining an electrostatic ion beam trap (EIBT) with a reaction microscope (REMI) to study the dynamics of (molecular) ions and charged clusters. Ions are stored in the EIBT in a linear oscillatory motion at some keV. The EIBT enables ion beam preparation, including e.g. limiting the transversal momentum as well as allowing mass analysis and selection. Inside the REMI the ion beam is crossed with a target/projectile beam and the resulting reaction products are detected with time- and position-sensitive detectors. This allows reconstruction of their 3D-momenta. Ions, neutral atoms/molecules and electrons can be detected in coincidence. This thesis focuses on the implementation of the ion-atom collision experiments in the TrapREMI. For this purpose a supersonic gas jet setup was built to provide a cold gas beam as a target. Afterwards, the first proof-of-principle experiment was conducted: A singly-charged argon ion captures an electron from a neutral argon atom and both particles are detected in coincidence. Additionally, a new ion source was installed, voltage control was modified for a simpler operation and a technique for ion bunch creation inside the EIBT was briefly tested.