Vacuum DMS with high efficiency ion guides
US9921183B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 6, 2014 |
| Grant date | Mar 20, 2018 |
| Priority date | — |
| Expiry date | Dec 6, 2034 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J49/066
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Differential mobility spectrometry is performed under vacuum. Ions generated in a high pressure region are received from the inlet orifice of a vacuum chamber using a first ion guide located in the vacuum chamber. The first ion guide focuses the generated ions on a DMS device inlet end using a plurality of tapered electrodes. The DMS device is coaxial and adjacent to the first ion guide. The DMS device separates the focused ions using a plurality of electrodes. The inscribed diameter at the DMS device inlet end is larger than the inscribed diameter at the first ion guide exit end to maximize ion transfer. The separated ions are received from the DMS device using a second ion guide coaxial and adjacent to the DMS device. The second ion guide focuses the separated ions on an exit orifice of the vacuum chamber using a plurality of tapered electrodes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.