Quadrupole mass spectrometer
US6737644B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 25, 2002 |
| Grant date | May 18, 2004 |
| Priority date | — |
| Expiry date | May 15, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J49/4215
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A quadrupole mass spectrometer includes: an ion source for generating ions; a quadrupole mass filter for selectively passing object ions having a predetermined mass number among the ions from the ion source; an ion detector for detecting the object ions; an ion converging lens placed between the quadrupole mass filter and the ion detector; and a voltage source for applying an optimal voltage to the ion converging lens, wherein the voltage has a polarity opposite to that of the object ions and the absolute value of the voltage is larger than that of a voltage at which the converging efficiency of the object ions is the largest. With respect to the overall S/N ratio, the optimal state is achieved when the optimal converging voltage which is greater than the maximum converging voltage is applied to the ion converging lens.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.