Hannover 2010 – wissenschaftliches Programm

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MS: Fachverband Massenspektrometrie

MS 2: Speicherringe und neue Entwicklungen

MS 2.1: Hauptvortrag

Montag, 8. März 2010, 16:30–17:00, F 428

Cold electron collisions at ion storage rings — •Andreas Wolf — Max-Planck-Institut für Kernphysik, Heidelberg

Cold electron collisions, often driven by Feshbach resonances, are important in a wide range of ionized media and also open efficient pathways for electrons to destroy molecular compounds. Highest precision in their study is reached using merged beams inside ion storage rings. Intense cold electron beams, velocity-matched to the stored ion beams, can realize collision energies as low as a few Kelvin (near 1 meV). The electrons not only initiate reactive collisions, but also cool the internal quantum states of the stored ions and lead to their phase-space compression (beam cooling). Ion beams, moreover, offer powerful tools for coincidence momentum spectroscopy on the products of individual reactions. – Recent beam cooling results and high-resolution atomic and molecular collision studies at the magnetic ion storage ring TSR will be presented, with particular emphasis on the lately introduced intense electron beams from cryogenic semiconductor photocathodes. These sources open the door towards very low electron beam energies (down to a few eV) and offered efficient phase-space cooling already for compounds such as water ions. Few-Kelvin electron collisions will also become available at electrostatic ion storage rings, where the ion energies lie in the range of only a few keV per nucleon. Here, phase-space compression and low-energy merged beams collisions will be applicable to a wide range of heavy molecular ions, heavy singly charged atoms, and slow highly charged ion beams.