Laser desorption ion source with ion guide coupling for ion mass spectroscopy
US7405397B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 22, 2005 |
| Grant date | Jul 29, 2008 |
| Priority date | — |
| Expiry date | May 14, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J49/164
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A laser desorption ion source provides enhanced ion sampling efficiency and measurement sensitivity by using one or more ion guides to effectively capture ions in a plume emitted from the ion target and guide the ions through an aperture into a downstream vacuum chamber. In one configuration using two RF multipole ion guides, a first RF multipole ion guide disposed next to the ion target is selected to be sufficiently large to capture a substantial portion of the plume, while the second RF multipole ion guide disposed between the first multipole ion guide and the aperture has a smaller dimension to assist focusing of ions into the aperture. The first RF multipole ion guides the ions in the plume into the second RF multipole ion guide, which then focuses the ions so that they pass through the aperture into the downstream vacuum chamber.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.