Mass spectrometer

US11887832B2 · kind B2 · utility

Assignee

• THERMO FISHER SCIENTIFIC (BREMEN) GMBH · DE

Inventors

• Johannes Schwieters · Ganderkesee, DE
• Gerhard Jung · Delmenhorst, DE

Key dates

• Filing date: Mar 24, 2022
• Grant date: Jan 30, 2024
• Expiry date: Mar 24, 2042

Classification

• Technology area (CPC H): Electricity
• CPC primary: H01J49/105
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

An isotope ratio mass spectrometer has an ion source, a static field mass filter, a reaction cell to induce a mass shift reaction, and a sector field mass analyser for spatially separating ions from the reaction cell according to their m/z. A detector platform detects a plurality of different ion species separated by the sector field mass analyser. The static field mass filter has a first Wien filter that deflects ions away from a longitudinal symmetry axis of the spectrometer in accordance with the ions' m/z, and a second Wien filter that deflects ions back towards the longitudinal symmetry axis in accordance with the ions' m/z. An inverting lens is positioned along the longitudinal axis between the Wien filters to invert the direction of deflection of the ions from the first Wien filter. The static field mass filter provides high transmission and improved spectrometer sensitivity. The first and second Wien filters permit simple tuning.