Processes of the charge-
stripping type:
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
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
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
mass spectrum. Interference from product ions from processes of the type:
where
,
,
and
(
)
are the masses of
,
and
, respectively, and where
,
can arise in
mass spectra.
Source:
PAC, 1991, 63, 1541
(Recommendations for nomenclature and symbolism for mass spectroscopy (including an
appendix of terms used in vacuum technology). (Recommendations 1991))
on page 1552
mass spectrum
