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Synopsis The installation of a reaction microscope (COLTRIMS [1]) in the electrostatic Frankfurt Low Energy Storage Ring (FLSR) [2] has been completed. A first experiment, exploring the KER for dissociative electron transfer to HeH +  ions at 20 keV from a cold supersonic He gas target have been carried. Even at the moderate vacuum of 10 −8  mbar a change of the KER and the Q value distribution due to cooling of the molecular ions during the storage time can be observed. In this contribution the final experiment, performed after heating the ring will be discussed.

Kinetic energy release (KER) of vibrationally cold HeH+: experiments at the reaction microscope in the Frankfurt low-energy storage ring (FLSR)