Electrospray ion source
US7391019B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 21, 2006 |
| Grant date | Jun 24, 2008 |
| Priority date | — |
| Expiry date | Feb 19, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J49/044
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An on-axis ion source has an ionization chamber and an adjacent low-pressure region. The on-axis ion source also includes a capillary tube having an axial bore for supporting fluid communication between the ionization chamber and the adjacent low-pressure region, the axial bore of the capillary tube being substantially concentrically aligned with the orifice of a skimmer located downstream in the ion path from the capillary tube. A blocking element is provided in an aligned facing arrangement with the axial bore of the capillary tube and on an opposite side of the orifice relative to the capillary tube. The blocking element receives droplets or particles flowing through the axial bore of the capillary tube and passing through the orifice of the skimmer. The combination of an on-axis arrangement and the use of a blocking element results in improved signal-to-noise level due to enhanced ion transmission and reduction of noise arising from passage of undesolvated droplets and particles to the mass analyzer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.