| 摘要 |
A FAIMS cell including one of side-to-side cylindrical geometry electrode s and stacked-plate electrodes is adapted with a medial surface feature for focusing ions along a lateral direction within an ion separation region of t he FAIMS cell. The medial surface feature is provided as one of a recessed c hannel within an electrode surface and a protruding ridge extending from an electrode surface. The medial surface feature is aligned with a defined aggr egate direction of ion travel within the ion separation region for focusing ions along the lateral direction in opposition to the tendency of ions to sp read out as a result of space charge repulsion, ion-ion repulsive forces, di ffusion and gas flows. The electrical field and fluid dynamic effects produc ed by the medial surface feature beneficially affect ion transmission effici ency through the FAIMS cell.
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