Asymmetric-field ion guiding devices
US6730904B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 30, 2003 |
| Grant date | May 4, 2004 |
| Priority date | — |
| Expiry date | Apr 30, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J49/062
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An electrodynamic ion guide for a mass spectrometer comprises multiple sections having different guiding field central axes. At least one of the guiding fields can be an asymmetric guiding field having a quadrupole component and a dipole component. The ion guide can be positioned in a guide chamber with the first field central axis facing an inlet aperture and the second field central axis facing an outlet aperture. The ion guide allows the efficient use of a guide chamber with no line of sight from the inlet aperture to the outlet aperture, such that undesired liquid droplets entering the guide chamber through the inlet aperture do not exit through the outlet aperture. In the preferred embodiment, the ion guide comprises a plurality of longitudinally-concatenated, progressively narrowing segments, each segment including four flat plates arranged symmetrically about a central geometric axis.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.