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MPINP:
Quantendynamik - Abteilung Blaum
Abstract:
The focus of this work are experimental studies on dissociative recombination
in merged-beams experiments at storage rings. Dissociative recombination
of the sulfur hydride cation (SH+) has been investigated at the
magnetic Test Storage Ring (TSR) in Heidelberg, Germany. Measurements
of the reaction rate coeficient and momentum spectroscopy of the fragmentation
products have been performed. From these, the total reaction cross
section and the branching ratios of the different product states were derived.
These kind of studies will be continued at the new electrostatic and Cryogenic
Storage Ring (CSR) in Heidelberg. Operated at cryogenic temperatures,
the vacuum conditions are improved by several orders of magnitude
which enables the storage of heavy molecules in their lowest ro-vibrational
quantum state. In this way, gas phase processes can be investigated under
conditions similar to those found in interstellar media. A new multicoincidence
particle imaging detector was developed. For experiments on
dissociative recombination in this harsh environment, the detector has been
partly simulated, constructed, built and tested.
