Hamburg 2009 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 13: Molekülphysik Poster 1
MO 13.39: Poster
Dienstag, 3. März 2009, 16:30–19:00, VMP 8 Foyer
Cold molecular anions in a multipole rf trap — •Rico Otto1, Petr Hlavenka1, Sebastian Trippel1, Martin Stei1, Matthias Weidemüller2, and Roland Wester1 — 1Physikalisches Institut, Universität Freiburg, Hermann-Herder-Str. 3, 79104 Freiburg — 2Physikalisches Institut, Universität Heidelberg, Albert-Überle-Str. 3-5, 69120 Heidelberg
When studying interaction processes of stored cold anions only few quantum states
of the investigated systems are populated. Energies on the scale of rotational levels
become dominant at temperatures of only a few Kelvin. We study slow
collisions and laser induced processes of cold anions in a 22pole radio frequency trap.
Proton transfer from H2 to NH2− has been found to show unexpected low temperature
characteristics in the reaction rate coefficient below 20 K [1]. Measurements of the
absolute photodetachment cross section [2] have been carried out for O−,
a calibration standard for photodetachment, and for OH− [3]. The OH−
photodetachment cross section shows no temperature dependence in the range between 8 -
300K. A new level of accuracy has been reached using a novel 2D tomography scanning
technique. This technique allows to image the ion distribution in the 22pole trap,
probing the trapping potential.
R. Otto et al., Phys. Rev. Lett. 101, 063201 (2008)
S. Trippel et al., Phys. Rev. Lett. 97, 193003 (2006)
P. Hlavenka et al., submitted