Hannover 2010 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 9: Ultra-Cold Atoms, Ions and BEC II (with Q)

A 9.6: Vortrag

Mittwoch, 10. März 2010, 11:45–12:00, F 303

An AC electric trap suitable for ground-state CO molecules — •Amudha Kumari Duraisamy, Adela Marian, Wieland Schöllkopf, and Gerard Meijer — Fritz-Haber-Institut, Faradayweg 4-6, Berlin, Germany

When trapping polarizable neutral particles using AC electric fields, the parameter which determines the strength of the interaction is α/m, where α is the (total) quadratic Stark coefficient and m is the mass of the particle. As this ratio is nearly identical for 87Rb and 12CO in their ground states, they would behave very similarly when confined in an AC electric trap. We have already demonstrated and studied trapping of ground-state Rb in a macroscopic AC electric trap with a depth of a few microkelvins [1, 2] . We now propose to use the Rb atoms as a case study for the behaviour of AC-trapped ground-state CO molecules.

To this end, we have implemented a new AC trap where all the dimensions were scaled down by a factor of two to increase the available trap depth. Stable electric trapping is observed in a wider range of switching frequencies around 300 Hz, in agreement with trajectory calculations. We have trapped about 1.3 × 105 atoms with densities of 8 × 109 cm−3 for an electric field of 60 kV/cm at the center of the trap.


1. S. Schlunk et al., PRL 98, 223002 (2007),

2. S. Schlunk et al., PRA 77, 043408 (2008)

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