title: A linear AC trap for polar molecules in their ground state.
abstract: A linear AC trap for polar molecules in high-field seeking states has been devised and implemented, and its characteristics have been investigated both experimentally and theoretically. The trap is loaded with slow 15ND3 molecules in their ground state (para-ammonia) from a Stark decelerator. The trap's geometry offers optimal access as well as improved loading. We present measurements of the dependence of the trap's performance on the switching frequency, which exhibit a characteristic structure due to nonlinear resonance effects. The molecules are found to oscillate in the trap under the influence of the trapping forces, which were analyzed using 3D numerical simulations. On the basis of expansion measurements, molecules with a velocity and a position spread of 2.1 m/s and 0.4 mm, respectively, are still accepted by the trap. This corresponds to a temperature of 2.0 mK. From numerical simulations, we find the phase-space volume that can be confined by the trap (the acceptance) to be 50 mm3 (m/s)3.
authors.affiliation: Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, D-14195 Berlin, Germany. schnell@fhi-berlin.mpg.de
authors.forename: Melanie
authors.initials: M
authors.lastname: Schnell
authors.forename: Peter
authors.initials: P
authors.lastname: Lützow
authors.forename: Jacqueline van
authors.initials: Jv
authors.lastname: Veldhoven
authors.forename: Hendrick L
authors.initials: HL
authors.lastname: Bethlem
authors.forename: Jochen
authors.initials: J
authors.lastname: Küpper
authors.forename: Bretislav
authors.initials: B
authors.lastname: Friedrich
authors.forename: Monika
authors.initials: M
authors.lastname: Schleier-Smith
authors.forename: Henrik
authors.initials: H
authors.lastname: Haak
authors.forename: Gerard
authors.initials: G
authors.lastname: Meijer