Siegel der Universität

Universität zu Köln
Mathematisch-Naturwissenschaftliche Fakultät
Fachgruppe Physik

I. Physikalisches Institut

Temperatur-/Kalibrationsmessungen am Lirtrap-Experiment

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Laser induced reactions (LIR) belong to the family of "action spectroscopy" methods where the influence of the laser light on the investigated mass-selected trapped ions is monitored by detecting induced changes of the ion cloud composition in a high-efficiency ion counter. In the special case of LIR, changes of the rate coefficient of an endothermic ion-molecule reaction serve to detect the excitation of the parent ionic species. This offers not only the possibility of doing very high sensitivity spectroscopy on transient ions (a number of only 1000 ions per trapping period is enough), but LIR can yield information on state-selected reaction rate coefficients and lifetimes of excited states.

Contact: Prof. Dr. Stephan Schlemmer