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Berlin 2005 – scientific programme

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Q: Quantenoptik und Photonik

Q 20: Poster Fallen & Kühlung

Q 20.13: Poster

Monday, March 7, 2005, 11:00–12:30, Poster HU

Sympathetic Cooling of Helium and Molecular Hydrogen Ions — •Bernhard Roth, Peter Blythe, Ulf Fröhlich, Helmut Wenz, and Stephan Schiller — Heinrich-Heine-Universität Düsseldorf

Few-body Coulomb systems belong to the most fundamental in physics, and have been central in the development of quantum mechanics, relativistic quantum mechanics, QED and nuclear physics. Helium and molecular hydrogen ions are interesting systems, e.g. for precision tests of QED and measurement of fundamental constants. As one of the simplest molecules, HD+ is particularly suitable to test theories of molecular structure. One important aspect in future precision experiments will be the availability of trapped ultracold helium and molecular hydrogen ions, in order to minimize the influence of Doppler broadening and allow a precise study of systematic effects.
We have generated ultracold ensembles of 3He+, 4He+, and of various molecular hydrogen isotopes, by sympathetic cooling using laser-cooled 9Be+ in a linear rf-trap. Stable ion plasmas in an ordered state (Coulomb crystal) containing several 100 localized sympathetic particles and up to 6.000 Be+ ions at temperatures of <20 mK were obtained. We have studied the properties of these mixed-species ion plasmas, both for spheroidal and ellipsoidal symmetry, as well as chemical reactions between the atomic coolants and neutral light molecules. The experimental results are compared to molecular dynamics simulations. The present work also indicates the feasibility of cooling and trapping highly charged atomic ions using 9Be+ as coolant.

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