Hannover 2016 – scientific programme
Parts | Days | Selection | Search | Updates | Downloads | Help
MO: Fachverband Molekülphysik
MO 10: Atomic clusters II (with A)
MO 10.1: Talk
Tuesday, March 1, 2016, 14:30–14:45, f107
Laser-induced delayed electron emission of Co4− clusters — •Christian Breitenfeldt1,2, Klaus Blaum2, Sebastian George2, Jürgen Göck2, Jonas Karthein2, Thomas Kolling3, Christian Meyer2, Jennifer Mohrbach3, Gereon Niedner-Schatteburg3, Lutz Schweikhard1, and Andreas Wolf2 — 1Institut für Physik, Ernst-Moritz-Arndt Universität, Felix-Hausdorff-Str. 6, 17487 Greifswald, Germany — 2Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany — 3Fachbereich Chemie, Universität Kaiserslautern, 67663 Kaiserslautern, Germany
The Cryogenic Trap for Fast ion beams CTF located at the Max-Planck-Institute for nuclear physics is an electrostatic ion beam trap setup for the study of dynamical processes of stored ion beams. A tunable optical parametric oscillator laser is used to induce delayed electron detachment, monitored by the rate of neutralized particles leaving the trap region as a function of time after laser excitation. By comparing the count rates after laser excitation at various photon energies ranging from 0.95 eV to 1.88 eV and different storage times the ions’ internal energy distribution can be reconstructed. Two types of ion sources have been used to produce Co4−: First, a caesium ion sputter source, known to produce ro-vibrationally excited ions at temperatures of more than 1000 K, and second, a laser vaporization source with helium expansion to produce ions with ro-vibrational excitation levels corresponding to low temperatures. The cooling and heating process of Co4− has been observed.