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Universität zu Köln
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Mathematisch-Naturwissenschaftliche Fakultät
Fachgruppe Physik

I. Physikalisches Institut

Methods

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Collision Dynamics

Description

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. ...more

Figure(s)

Deuteration of H3+ in a pure HD environment at T = 13 K.

Instruments

LIRTrap
The 22-pole ion trap apparatus LIRTrap is used both for kinetic and spectroscopic characterization of ions.
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COLTRAP
COLTRAP and FELion are two new generation 22-pole ion trap instruments developed and built in our laboratory. Both instruments offer unique possibilities to study the kinetics of ion-molecule reactions at low temperatures, and to use highly sensitive methods for spectroscopic studies of molecular ions. Whereas the COLTRAP instrument is located in the Cologne laboratories, FELion has been installed in October 2014 at the FELIX Laboratory (Radboud University Nijmegen, Netherlands).
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FELion
COLTRAP and FELion are two new generation 22-pole ion trap instruments developed and built in our laboratory. Both instruments offer unique possibilities to study the kinetics of ion-molecule reactions at low temperatures, and to use highly sensitive methods for spectroscopic studies of molecular ions. Whereas the COLTRAP instrument is located in the Cologne laboratories, FELion has been installed in October 2014 at the FELIX Laboratory (Radboud University Nijmegen, Netherlands).
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