| CPC H01J 49/065 (2013.01) [G01N 27/622 (2013.01); H01J 49/067 (2013.01); H01J 49/068 (2013.01)] | 20 Claims |

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1. An ion guide assembly comprising:
two planar mounting components;
first and second ion guides mounted on the two planar mounting components such that the ion guides are spaced apart from each other, wherein at least one of the planar mounting components has an aperture therethrough that is located between the positions on said at least one mounting component at which the first and second ion guides are mounted; and
an ion optical device sized and configured to be inserted through the aperture in the planar mounting component and into the space between the first and second ion guides.
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