TANDEM MASS SPECTROSCOPY:  This type of
spectroscopy simply involves the coupling of one
mass spectrometer to another and this hyphenated
technique has resulted in dramatic progress in the
analysis of complex mixtures.
SECONDARY ION MASS SPECTROSCOPY:  This
is one of the most highly developed of the mass
spectrometric surface methods, with several
manufacturers offering instruments for this technique.
It involves the bombarding of a surface with a beam
of ions formed in an ion gun. The ions generated
from the surface layer are then drawn into a
spectrometer for mass analysis.