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Categories of exhibits

RF Hexapole Transfer Lens

Exhibit no. 447

RF-only multipole ion guides can be used for transporting ions from one part of a vacuum system to another in a differentially pumped system. They consist of metal rods arranged symmetrically around a central axis. The rods are separated into two pairs, alternating in such a way that each rod is neighbored by rods of the other pair. The high-frequency voltage is applied to one set of rods, while the same but phase-opposite voltage is applied to the other set of rods. RF-only multipole ion guides are typically used in higher-pressure regions (1 Torr - 1 mTorr), where ions undergo regular collisions.  Reducing kinetic energy makes it easier for the ion guide to focus the ion beam. Hexapole guides consist of six rods. They are often used because they transmit a broad range of ions and focus them into a narrow beam.

The exhibit transferred ions generated in the ZSpray source to the quadrupole analyzer of Q-Tof micro mass spectrometer manufactured by Micromass in 2004. The hexapole was located in an independently pumped source housing, behind the extraction cone. It is equipped with a differential pumping aperture for separating the source region from the quadrupole analyzer.

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