Atmospheric pressure ion source high pass ion filter
US7112786B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 27, 2005 |
| Grant date | Sep 26, 2006 |
| Priority date | — |
| Expiry date | Jun 27, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J49/10
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
For generation and delivery of ions from an ionization chamber through an ion entrance orifice to a mass analyzer operating at high vacuum, high pass ion filtration is effected within the ionization chamber by application of electrical potentials to an electrode associated with the ion entrance orifice and to an electrode between the ionization region and the ion entrance orifice to create a retarding electric field upstream from the ion entrance orifice. The retarding electric field hinders the movement to the ion entrance orifice of ions having drift velocities below a lower limit, and as the retarding voltage gradient is made steeper, the lower limit increases.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.