MS/MS mass spectrometer
US8384028B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 13, 2008 |
| Grant date | Feb 26, 2013 |
| Priority date | — |
| Expiry date | Mar 1, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J49/0045
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
During a halt period of time when the introduction of ions is temporarily discontinued to change an objective ion to be selected by a first mass separator in the previous stage, a pulsed voltage having a polarity opposite to that of the ions remaining in a collision cell (4) is applied to an entrance lens electrode (42) and exit lens electrode (44). The ions are pulled by the DC electric field created by this voltage, to be neutralized and removed by colliding with the lens electrodes (42, 44). Thus, the residual ions, which may cause a crosstalk, can be quickly removed from the inner space of the collision cell (4) without contaminating an ion guide (5) to which a radio-frequency is applied. Since no radio-frequency voltage is applied to the lens electrodes (42, 44), the circuit for applying the pulsed voltage can have a simple configuration. Thus, the cost increase is suppressed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.