Quadrupole trap improved technique for ion isolation
US5198665A · kind A · utility
35Cited by
8References
17Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 29, 1992 |
| Grant date | Mar 30, 1993 |
| Priority date | — |
| Expiry date | May 29, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J49/429
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A method for isolating an ion in a QIT (1) employing values from a mass axis calibration chart to establish the maximum DAC value to scan to in order to scan out m(p)-1 and less during ramp up of RF trapping field while applying a specifically selected fixed supplemental frequency applied during said calibration; and employing values from the calibration curve to establish the DAC value to scan out m(p)+1 and greater during ramping down of RF trapping field, while applying a previously determined fixed broadband spectrum to the QIT end caps.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.