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Universität zu Köln
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Mathematisch-Naturwissenschaftliche Fakultät
Fachgruppe Physik

I. Physikalisches Institut

Methods

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Laser induced reactions (LIR)

Description

Laser induced reactions (LIR) belong to the family of "action spectroscopy" methods. 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 performing 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. ...more

Figure(s)

LIR principle
LIR example: The reaction equilibrium in the system H3+ + HD ⇌ H2D+ + H + E is shifted by the laser radiation.

Instruments

LIRTrap
The 22-pole ion trap apparatus LIRTrap is used both for kinetic and spectroscopic characterization of ions.
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