Preferred Label : E/2 mass spectrum;
Detailed label : E2 mass spectrum;
IUPAC definition : Processes of the charge-stripping type: \[{M} { } {X}\rightarrow {M} {2 } {X} {e}\]
occuring in a collision cell (containing a 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
E is set to half the value required to transmit the main ion-beam, the only ions to
be transmitted will be those with a kinetic energy/charge ratio half, or almost exactly
half, that of the main ion beam. The product ions of the charge-stripping process
fulfil this 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 called an E/2 mass spectrum. Interference from product ions from
processes of the type: \[{M}_{1} { } {X}\rightarrow {M}_{2} { } {X} {M}_{3}\] where
m 1, m 2, and (m 1- m 2) are the masses of M 1 , M 2 and M 3, respectively, and
where m 2 0.5 m 1, can arise in E/2 mass spectra.;
Origin ID : M03751;
See also
Processes of the charge-stripping type: \[{M} { } {X}\rightarrow {M} {2 } {X} {e}\]
occuring in a collision cell (containing a 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
E is set to half the value required to transmit the main ion-beam, the only ions to
be transmitted will be those with a kinetic energy/charge ratio half, or almost exactly
half, that of the main ion beam. The product ions of the charge-stripping process
fulfil this 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 called an E/2 mass spectrum. Interference from product ions from
processes of the type: \[{M}_{1} { } {X}\rightarrow {M}_{2} { } {X} {M}_{3}\] where
m 1, m 2, and (m 1- m 2) are the masses of M 1 , M 2 and M 3, respectively, and
where m 2 0.5 m 1, can arise in E/2 mass spectra.
