Sample introduction device for mass spectrometers
US4562351A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 9, 1983 |
| Grant date | Dec 31, 1985 |
| Priority date | — |
| Expiry date | Nov 9, 2003 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J49/0495
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The invention consists of a mass spectrometer having a sample insertion probe on which a reference compound and an unknown sample can be simultaneously introduced without mixing into a field ionization or ion or neutral particle bombardment ion source. An insulated support is mounted by a parallel hinge on the end of the probe shaft. Two or more separated segments or emitter wires, one carrying the unknown sample, another carrying an appropriate reference compound, are mounted on a base member which is fitted to the support. A drive shaft, concentric with the outer probe shaft, has an eccentric peg on the end, which engages with a cam on the support, so that rotation of the drive shaft results in an oscillating motion of the segments or emitters, alternately positioning them in the optimum position for ionization. A spectrum of the sample or the reference compound can be obtained when required by selecting the appropriate position of the drive shaft. Rotation of the drive shaft may be controlled by a servo- mechanism and a computer. As a result, improved accuracy of mass measurement of peaks in the mass spectrum of the sample is achieved.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.