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Issue 42, 2011
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On deflection fields, weak-focusing and strong-focusing storage rings for polar molecules

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Abstract

In this paper, we analyze electric deflection fields for polar molecules in terms of a multipole expansion and derive a simple but rather insightful expression for the force on the molecules. Ideally, a deflection field exerts a strong, constant force in one direction, while the force in the other directions is zero. We show how, by a proper choice of the expansion coefficients, this ideal can be best approximated. We present a design for a practical electrode geometry based on this analysis. By bending such a deflection field into a circle, a simple storage ring can be created; the direct analog of a weak-focusing cyclotron for charged particles. We show that for realistic parameters a weak-focusing ring is only stable for molecules with a very low velocity. A strong-focusing (alternating-gradient) storage ring can be created by arranging many straight deflection fields in a circle and by alternating the sign of the hexapole term between adjacent deflection fields. The acceptance of this ring is numerically calculated for realistic parameters. Such a storage ring might prove useful in experiments looking for an EDM of elementary particles.

Graphical abstract: On deflection fields, weak-focusing and strong-focusing storage rings for polar molecules

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Publication details

The article was received on 08 May 2011, accepted on 13 Sep 2011 and first published on 06 Oct 2011


Article type: Paper
DOI: 10.1039/C1CP21477B
Citation: Phys. Chem. Chem. Phys., 2011,13, 19052-19058
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    On deflection fields, weak-focusing and strong-focusing storage rings for polar molecules

    A. J. de Nijs and H. L. Bethlem, Phys. Chem. Chem. Phys., 2011, 13, 19052
    DOI: 10.1039/C1CP21477B

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