Trapping
131Quadrupole ion trap — Scheme of a Quadrupole ion trap of classical setup with a particle of positive charge (dark red), surrounded by a cloud of similarly charged particles (light red). The electric field E (blue) is generated by a quadrupole of endcaps (a, positive)… …
132Columbia District — This page is for the fur district of the Hudson s Bay Company in the Pacific Northwest. For the United States capital district, see District of Columbia. Map of the Oregon Country jointly occupied by the US and Britain. The Columbia Department at …
