Siegel der Universität

Universität zu Köln
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Mathematisch-Naturwissenschaftliche Fakultät
Fachgruppe Physik

I. Physikalisches Institut

Collision Dynamics

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Experiments are performed in a variable temperature 22-pole ion trap. In the trap, mass selected ions are typically stored over seconds. Upon storage they are accommodated to the ambient trap temperature via He buffer gas cooling. The reactant gas is admitted to the trap at a fixed but variable number density. The trap content is analysed as a function of the trapping time. Rate coefficients are derived from the simulation of the underlying kinetics solving a set of rate equations. This method has been applied to several astrophysically interesting systems. The adjacent figure shows, for example, the deuteration of H3+ in a pure  HD environment at T=13K.