MS/MS mass spectrometer
US8698074B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 25, 2012 |
| Grant date | Apr 15, 2014 |
| Priority date | — |
| Expiry date | Apr 25, 2032 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J49/0045
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The gas conductance on the ion injection side of a collision cell is made larger than the gas conductance on the ion exit side by providing two ion injection apertures 23, 25 in the collision cell. Due to the different gas conductances, a CID gas supplied through the gas supply tube 31 generally flows in a direction from the ion injection side to the ion exit side in the collision cell, namely, in the ion's passage direction. When the ions injected in the collision cell 20 slow down upon contacting with the CID gas, their progress is assisted by the gas flow, so that the delay of the ions in the collision cell 20 is alleviated. As a result, it is possible to avoid a deterioration in the detection sensitivity of a target product ion and to prevent a ghost peak caused by the stay of the ions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.