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Instabilities of molecule motion in a linear ac trap

MPS-Authors
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Lützow,  Peter
Molecular Physics, Fritz Haber Institute, Max Planck Society;

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Schnell,  Melanie
Molecular Physics, Fritz Haber Institute, Max Planck Society;

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Meijer,  Gerard
Molecular Physics, Fritz Haber Institute, Max Planck Society;

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Citation

Lützow, P., Schnell, M., & Meijer, G. (2008). Instabilities of molecule motion in a linear ac trap. Physical Review A, 77, 063402-1-063402-8. doi:10.1103/PhysRevA.77.063402.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0010-FCBF-D
Abstract
The stability of a linear ac trap for neutral polar molecules is investigated both theoretically and experimentally. While the overall stability is found to be well described by the linearized equations of motion within the usual framework of stability diagrams, instabilities similar to those observed in anharmonic radio-frequency ion traps occur inside the nominal stable regions. These motional resonances are caused by strong anharmonic contributions to the trapping fields, that inevitably appear in ac traps for polar molecules. Nonlinear resonant energy transfer from the high-frequency source to molecules inside the trap is observed for the particles’ fundamental frequency of transverse oscillation being 1/4 of the forcing frequency.