Spatial zoom mode for accumulative trapped ion mobility spectrometry
US9546980B1 · kind B1 · utility
Inventors
Key dates
| Filing date | Nov 3, 2015 |
| Grant date | Jan 17, 2017 |
| Priority date | — |
| Expiry date | Nov 3, 2035 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N27/623
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The invention relates to the operation of ion mobility spectrometers based on gases pushing the ions over electrical field barriers, preferably in combination with mass spectrometers, and relates to trapped ion mobility spectrometers (“TIMS”). The invention proposes to accumulate and to scan the ions of a selected range of mobilities by using a long and flat electric field ramp created by additional voltages. By a voltage supplied at the beginning of the flat ramp, the lowest mobility of the mobility range of ions to be collected can be selected. By the difference of the voltages at the beginning and the end, the width of the mobility range is determined. The spatial zoom advantageously can collect considerable more ions of interest than a temporal zoom without severe losses by space charge effects, and more ions can be detected in the mass-mobility map.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.