An equilibrium multielectron bubble in liquid helium is a fascinating object with a spherical two-dimensional electron gas on its surface. We describe two ways of creating them. MEBs have been observed in the dome of a cylindrical cell with an unexpectedly short lifetime; we show analytically why these MEBs can discharge by tunneling. Using a novel method, MEBs have been extracted from a vapor sheath around a hot filament in superfluid helium by applying electric fields up to 15 kV/cm, and photographed with high-speed video. Charges as high as 1.6x10-9 C (~1010 electrons) have been measured. The latter method provides a means of capture in an electromagnetic trap to allow the study of the extensive exciting properties of these elusive objects.
@article{arxiv.0910.3224,
title = {Novel Methods to Create Multielectron Bubbles in Superfluid Helium},
author = {J. Fang and Anatoly. E. Dementyev and J. Tempere and Isaac F. Silvera},
journal= {arXiv preprint arXiv:0910.3224},
year = {2009}
}