Setup of a Reaction Microscope for the Cryogenic Storage Ring CSR and first Measurements

This thesis describes the setup of the first cryogenic reaction microscope, a new addition to the Cryogenic Storage Ring CSR. A technical description of the major components of the reaction microscope is presented. Selected results of the first experiments are discussed. The electron-photo-detachment from CH– was investigated as a proof-of-principle experiment of photo-electron spectroscopy. All visible features correspond to known transitions from the molecular ion to the neutral. The Si– + Ar collision is used as an example of a negative ion - neutral interaction. The process for electron loss with simultaneous target ionization is identified as a correlated interaction of target and projectile electrons. The cross section ratio, with and without simultaneous target ionization, was found to be an order of magnitude higher than expected. For positive ion beam, electron transfer from a He, Ne or Ar neutral gas target to a Ar+ projectile was investigated. Transitions into ground and excited projectile states could be identified for all targets. In addition, transfer target excitation for Argon target and electron transfer into metastable Ar+ states from Helium and Neon targets is seen. The projectile scattering angle is extracted by the momentum transfer on the recoil ion.