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.