Mass-analyzed ion kinetic energy spectrometry

{{DefName|In a reverse geometry sector mass spectrometer, the measurement of the kinetic energies of the fragment ions formed in the region between the magnteic and electric sectors. A beam of [[precursor ion]s is isolated with a constant B value in the magnetic sector and the field E in the electric is scanned to determine the fragment ion masses. The width of the resulting peaks gives the kinetic energy released during fragmentation}}