Method for exciting the oscillations of ions in ion traps with frequency mixtures
US5654542A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 19, 1996 |
| Grant date | Aug 5, 1997 |
| Priority date | — |
| Expiry date | Jan 19, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J49/428
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A method for the simultaneous resonant excitation of the oscillations of ions of various mass-to-charge ratios in ion traps, particularly for the ejection of undesirable ion species, by applying RF frequencies with various frequency components to electrodes of the ion trap. The method consists in generating and storing a broadband signal for as short a time as possible so that it can be fed to the ion trap a number of times in succession cyclically, without generating undesirable interference due to phase shifts. The excitation of the ions should be as temporally constant as possible throughout the waveform period. The duration of the waveform period depends on the mass resolution required. Excitation is terminated by controlling the broadband signal gradually toward zero in a constant function.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.