RECOMBINATION OF AU25-ELECTRONS AT VERY-LOW ENERGIES( WITH FREE)

Recombination of Au25+ ions with free electrons has been investigated in a merged-beams experiment at the UNILAC of GSI in Darmstadt. Specia l emphasis was put on the recombination at very low energies in the el ectron-ion centre-of-mass frame. At E-rel = 0 eV we found an enormous recombination rate exceeding the theoretical expectations for radiativ e recombination by a factor of 365. For further investigation of this enhancement, the electron density and the magnetic field guiding the e lectron beam were varied. While an increase of the electron density by a factor of 10 had little influence, the measured rate coefficient in creased significantly with the magnetic field strength.