  We report on the design and experimental characterization of a
surface-electrode multipole ion trap. Individual microscopic sugar particles
are confined in the trap. The trajectories of driven particle motion are
compared with a theoretical model, both to verify qualitative predictions of
the model, and to measure the charge-to-mass ratio of the confined particle.
The generation of harmonics of the driving frequency is observed as a key
signature of the nonlinear nature of the trap. We remark on possible
applications of our traps, including to mass spectrometry.
