Heidelberg 2015 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 2: Atomic clusters (with MO)

A 2.5: Vortrag

Montag, 23. März 2015, 12:45–13:00, M/HS1

Laser-induced delayed electron emission of Co4 anions — •Christian Breitenfeldt1,2, Klaus Blaum2, Sebastian George2, Jürgen Göck2, Jonas Karthein2, Thomas Kolling3, Christian Meyer2, Jennifer Mohrbach3, Gereon Niedner-Schatteburg3, Lutz Schweikhard1, and Andreas Wolf21Institut 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, Germany

The Cryogenic Trap for Fast ion beams CTF located at the Max-Planck-Institut für Kernphysik is an electrostatic ion beam trap (EIBT) setup. It is well suited to investigate dynamical processes of stored ion beams. Vibrational electron autodetachment (also called delayed electron detachment) is followed by monitoring the rate of neutral particles escaping from the EIBT either as a function of storage time or, in case of laser-induced electron loss processes as a function of the time after laser excitation. Two different ion sources were used: First, a cesium ion sputter source, producing ions with vibrational temperatures up to several hundred Kelvin, second, a laser vaporization source with helium expansion to produce Co4 anions where the vibrational excitation levels correspond to cryogenic temperatures. The ions were stored in the CTF and the cooling and heating of the ions was probed by the change in the delayed electron detachment rate. The photo excitation measurements were performed as a function of storage time and wavelengths of the laser. Recent results are presented and discussed.

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