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Berlin 2005 – scientific programme

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MO: Molekülphysik

MO 21: Heteronuclear Cold Molecules

MO 21.3: Talk

Saturday, March 5, 2005, 09:00–09:15, HU 2091

Preparation of Ultracold Molecular Hydrogen Ions in a Linear RF-Trap — •Bernhard Roth, Peter Blythe, Ulf Fröhlich, Helmut Wenz, and Stephan Schiller — Heinrich-Heine-Universität Düsseldorf

We present an experiment aimed at high-resolution spectroscopy of the ro-vibrational level structure of HD+. As one of the simplest molecules, HD+ is particularly suitable to test theories of molecular structure. Furthermore, the spectroscopic values of the ro-vibrational transition frequencies of HD+ can be used to obtain a more accurate value of the fundamental constant me/mp.
The HD+ molecular ions are confined in a linear Paul trap and cooled via Coulomb interaction by laser cooled 9Be+ ions stored simultaneously in the same trap (sympathetic cooling). For strong cooling a phase transition to an ordered state (Coulomb crystal) occurs. Stable crystals containing several 100 localized hydrogen molecules and up to 6.000 9Be+ ions at translational temperatures <20 mK were obtained. We have studied the properties of such mixed-species ion plasmas and found good agreement with results from molecular dynamics simulations. Currently, we are setting up a stabilized laser system for high–resolution spectroscopy of the (ν=0, N=4) - (ν=4,N=4) transition of HD+ at 1.4 µm.

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