| 摘要 |
An ion mobility separator or spectrometer is disclosed comprising an inner cylinder 2 and an outer cylinder 1 defining an annular volume 3 through which ions are transmitted. One or more spiral electrodes (a-f, Fig 4) are arranged on a surface of the inner and/or outer cylinder. A first device 5 is arranged to create an electric field to urge ions from one end of the mobility separator to the other, while a second device 6 is arranged to apply one or more transient DC voltages to the spiral electrodes (a-f) in order to urge ions towards a first end of the ion mobility separator. Also disclosed are ion mobility separators with planar geometries (Figs 14 & 15) utilising moving diagonal potential barriers (Figs 14 & 15) or a rotating spiral potential barrier (Figs 16 & 17). In each case, the net effect is to extend the effective path length of the ion mobility separator. |
