Method of selective ion trapping for quadrupole ion trap mass spectrometers
US5457315A · kind A · utility
16Cited by
5References
16Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 11, 1994 |
| Grant date | Oct 10, 1995 |
| Priority date | — |
| Expiry date | Jan 11, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J49/424
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A power efficient selective mass range trap filling process in which the RF trapping voltage connected to the ring electrode is slowly modulated simultaneously with: (1) e-beam ionization bombardment and (2) application of a broadband supplemental waveform containing selected secular frequencies to the QIT end caps. The modulation permits the reduction of the number of frequency components required in the broadband supplemental waveform and permits elimination of absorption by ions of energy from more than one supplemental frequency component at any one time.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.