Darmstadt 2008 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 24: Kalte Moleküle

MO 24.2: Poster

Donnerstag, 13. März 2008, 16:30–19:00, Poster C1

A planar multipol ion trap for spectrocopy of water clusters — •Christian Greve¹, Michael Kröner², Markus Debatin¹, Jochen Mikosch¹, Sebastian Trippel¹, Markus Reetz-Lamour¹, Peter Woias², Roland Wester¹, and Matthias Weidemüller¹ — ¹Physikalisches Institut, Universität Freiburg — ²Institut für Mikrosystemtechnik, Universität Freiburg

Microhydrated ions provide the opportunity to study solvent effects such as reaction rates and ionisation potentials as a function of the solvation number and are subject to numerous theoretical and experimental investigations. We plan to perform spectroscopy in a planar chip trap providing an almost rectangular multipol trapping potential [1]. For good optical access the trap consists of two opposing glass chips each with an electrode structure which can be made transparent using indium tin oxide. For the creation of water cluster ions we have designed a source composed of an electron gun, a pulsed valve and an electrostatic lens in a small differentially pumped vacuum chamber. Detection after storage is accomplished by a Wiley-McLaren type spectrometer setup. For future experiments with water cluster ions we will implement a quadrupole filter for mass selective loading, which will eventually be integrated onto the same chip with the trap. In addition, we will combine the trap with a magneto optical trap for experiments on interactions of trapped ions with ultracold atoms.

[1] M. Debatin et al., in prep.

[2] J. Mikosch et al., Phys. Rev. Lett. 98, 223001 (2007)