E/2 mass spectrum

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Orange Book


IUPAC. Analytical Division. Compendium of Analytical Nomenclature (the “Orange Book”). Definitive Rules, 1979.

E/2 mass spectrum

M2+ + X → M+ + X+

Processes of the charge-stripping type: M+ + X → M2+ + X + e occurring in collision cell (containing gas X) located in a field-free region preceding a magnetic and electric sector combination placed in either order, may be detected as follows;- if the instrument slits are wide and if the electric sector field is set to half the value required to transmit the main ion beam, the only ions transmitted will be those with kinetic energy/charge ratio half, or almost half, that of the main ion beam. The product ions of the above charge stripping process fulfil that condition. If the magnetic field, B, is scanned, a mass spectrum of such doubly-charged product ions and thus of their singly-charged precursors is obtained. Such a spectrum is termed a E/2 mass spectrum.

IUPAC Orange Book Chapter 12
Index of Orange Book Terms