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MO: Molekülphysik

MO 15: Post-Deadline Contributions Molecular Physics

MO 15.4: Poster

Freitag, 6. April 2001, 12:30–15:00, AT3

Laser Spectroscopy of Ultracold Molecular Hydrogen Ions — •U. Fröhlich¹, H. Schnitzler², A. Ostendorf¹, A. Peters², and S. Schiller¹ — ¹Heinrich-Heine Universität Düsseldorf, D-40225 Düsseldorf — ²Universität Konstanz, D-78457 Konstanz

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 of high interest to validate theories of molecular structure. It allows direct spectroscopic tests of quantum-electrodynamics and relativistic corrections in molecules. The HD⁺ molecular ions will be confined in a linear rf-trap and sympathetically cooled by interaction with laser cooled Be⁺ stored in the same trap. The method of sympathetic cooling relies on the long-range Coulomb interaction between the molecular ions and laser cooled atomic ions confined in the same trap. In combination with suitable laser sources an ultra-cold ensemble of molecules can lead to spectroscopic measurements with unprecedented spectral resolution. In the case of the HD⁺ molecule, to avoid the small 1st order Doppler-broadening, we plan to perform 2-photon spectroscopy of the (ν=0, N=4) - (ν=4, N=4) ro-vibrational transition using a single-frequency cw OPO with an output wavelength of 2.8 µm. The laser cooling light at 313 nm is produced by doubly resonant sum-frequency generation in LBO. Currently we are in the process of confirming the observation of laser cooled Be+ ions and optimizing the cooling process. The next step would be to add the molecules to the ion cloud and to characterize the process of sympathetic cooling.