Term: double-focusing mass spectrometer
https://doi.org/10.1351/goldbook.D01845

Definition:
An instrument which uses both direction and velocity focusing, and therefore an ion beam of a given mass/charge is brought to a focus when the ion beam is initially diverging and contains ions of the same mass and charge with different translational energies. The ion beam is measured electrically.

Source: Orange Book, 2nd ed., p. 201 (https://media.iupac.org/publications/analytical_compendium/)

Citation: 'double-focusing mass spectrometer' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. https://doi.org/10.1351/goldbook.D01845

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