Patent ID: 7683315

Claim:
A FAIMS cell, comprising: an elongated inner electrode having a longitudinal axis extending along a first direction, the inner electrode having a curved outer surface that defines a circle when viewed in a cross section that is taken in a plane normal to the longitudinal axis, the longitudinal axis passing through the center of the circle so defined; and, an outer electrode having an inner surface that is disposed in a spaced-apart facing relationship relative to the outer surface of the inner electrode so as to define an analytical gap therebetween, there being a first ion inlet orifice defined through a first portion of the outer electrode for supporting introduction of a flow of ions into the analytical gap, the first ion inlet orifice having a first ion injection axis that does not pass through the center of the circle so defined, wherein the outer electrode does not have defined through any portion thereof an ion inlet orifice having an ion injection axis that passes through the center of the circle so defined.