A variable length linear trap operating between 20-1000 Hz under standard temperature and pressure conditions is reported. We simulated and observed various kinds of stable patterns: linear strings, planar z ig-zag and volume structures. The interparticle distances depend on the trapped particle number and trap length. Our setup allows trapped microparticle diagnosis by various methods.

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Laser-cooled, trapped Yb+ is a versatile candidate for future frequency standards, with potential clock transitions in the microwave, infrared and optical regions.Research at NPL has concentrated on possible optical standards offered by narrow linewidth S-D and S-F transitions in the blue region of the spectrum.' The partial term scheme for Yb' is shown in Fig. 1. The %,12-2F,/1 octopole transition at 467 run is expected to have an ultranarrow natural linewidth (c

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