Pl. Elliott et al., EXPERIMENTAL INVESTIGATION OF LOW-FREQUENCY EDGE MAGNETOPLASMA MODES IN 2-DIMENSIONAL SHEETS OF IONS TRAPPED BELOW THE SURFACE OF SUPERFLUID-HELIUM, Czechoslovak journal of Physics, 46, 1996, pp. 331-332
We report the experimental observation of unconventional low-frequency
magnetoplasma modes in 2D sheets of ions. Some of them are multipole
edge modes of the type predicted to exist by Nazin & Shikin; others ha
ve a dependence of frequency on magnetic field similar to that for con
ventional edge modes and may be related to satellite modes discussed b
y Ye & Zaremba.