How can a 22-pole ion trap exhibit 10 local minima in the effective potential?

Details How can a 22-pole ion trap exhibit 10 local minima in the effective potential? How can a 22-pole ion trap exhibit 10 local minima in the effective potential?

2009-02-10

arxiv.org/abs/0902.1695v2

Physics

Atomic Physics

Scientific paper

The column density distribution of trapped OH$^-$ ions in a 22-pole ion trap is measured for different trap parameters. The density is obtained from position-dependent photodetachment rate measurements. Overall, agreement is found with the effective potential of an ideal 22-pole. However, in addition we observe 10 distinct minima in the trapping potential, which indicate a breaking of the 22-fold symmetry. Numerical simulations show that a displacement of a subset of the radiofrequency electrodes can serve as an explanation for this symmetry breaking.

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