Berlin 2001 – wissenschaftliches Programm
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Q: Quantenoptik
Q 17: Poster: Cooling and Trapping
Q 17.6: Poster
Mittwoch, 4. April 2001, 12:30–15:00, AT2
Cryogenic Magnetic Trap for Ultracold Atoms and Molecules — •Oliver Pradl, Dennis Weise, Robert Hauschild, Jürgen Mlynek, and Achim Peters — Fachbereich Physik and Optikzentrum Konstanz, Universität Konstanz, Fach M696, 78457 Konstanz, Germany.
We report on the progress of a new experiment to trap and evaporatively cool paramagnetic atoms as well as molecules. The experimental setup is based on a recently developed technique that combines buffer-gas loading with a strong magnetic quadrupole trap in a 3He/4He dilution refrigerator [1]. The general applicability of this cooling method opens up the opportunity to work with a great variety of paramagnetic particles, including rather big molecules.
First candidates for trapping are atomic chromium and molecular oxygen. While laser ablation can be efficiently used to produce chromium samples from a solid target inside the experimental cell, molecular oxygen could be transferred from room temperature via capillary injection.
In our setup, optical access from 6 sides will allow the exploration of different detection and imaging schemes. It also offers enhanced flexibility for future experiments, e.g. the transfer of the trapped species to an optical dipole trap. For the implementation of cavity-based spectroscopic methods at cryogenic temperatures we explore the possibility of using a monolithic sapphire experimental cell.
[1] R. deCarvalho et al., Eur. Phys. J. D 7, 289 (1999).