Mass spectrograph apparatus and method of driving ion guide
US9230788B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 16, 2012 |
| Grant date | Jan 5, 2016 |
| Priority date | — |
| Expiry date | Mar 16, 2032 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J49/36
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
In eight electrodes arranged at an interval of a rotational angle of 45° around an ion optical axis, two neighboring electrodes are electrically connected together as one group, and electrodes in alternate groups are also electrically connected together. A voltage VDC+v cos ωt is applied to electrodes in alternate groups around the optical axis, and a voltage VDC−v cos ωt is applied to the other electrodes. Then, while an ion guide has the same electrode structure as that of an octupole-type ion guide, a radio-frequency electric field mainly having a quadrupole field component is formed, and the ion guide can be used as a quadrupole-type ion guide. Accordingly, only by changing the wiring for applying a voltage by using the electrodes having the same structure, ion guides of, for example, a quadrupole type and an octupole type, having different properties such as ion receiving properties and ion passing properties can be achieved.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.