| 摘要 |
An analyser for separating ions according to their time of flight is provided comprising two opposing ion mirrors 40, 50 abutting at a first plane p1. Each mirror comprising inner 430, 440 and outer 450, 460 field-defining electrode systems elongated along an analyser axis z. The outer field-defining electrode system450, 460 surrounds the inner field-defining electrode system430, 440. The outer field-defining electrode system of one mirror 50 comprises two sections 452, 454, the sections abutting at a second plane p2. These comprise a first section 452 between the first plane p1 and the second plane p2, and a second section 454 adjacent the first section 452. The first section 452 has at least a portion which extends to a greater extent radially from the analyser axis z than an adjacent portion of the second section 454 at the second plane p2. This provides a split in the electrode for use as an exit and/or entrance aperture. |
