Charge inversion mass spectrum

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Orange Book Entry

Charge inversion processes of the types: M⁺ + X^{?????????????????????-}, M - + X²⁺ or M - + X ^{?????????????????????-} M⁺ + X + 2e respectively, occurring in a collision cell (containing a gas X) located in a field-free zone 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 connections to the two sectors, appropriate to transmission of either positive or negative main-beam ions, are simply reversed, the negative or positive product ions respectively will be transmitted. If the magnetic field is scanned a spectrum of such ions will be obtained and this is termed a charge-inversion spectrum. These are sometimes referred to as -E and +E spectra. Note: The terms ??????????????????????2E, E /2,-E or +E mass spectrum????????????????????????? should not be used without prior explanation of their meaning.

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