2E Mass Spectrum true This child of the former purgatory term m/z Separation Method was made obsolete. OBSOLETE A mass spectrum obtained by setting the electric sector field E to twice the value required to transmit the main ion-beam thereby allowing ions with a kinetic energy-to-charge ratio twice that of the main ion-beam to be transmitted. Product ions resulting from partial charge transfer reactions such as m^2+ + N ? m^+ + N^+ that occur in a collision cell (containing a gas, N) located in a field-free region preceding a magnetic and electric sector combination are detected. When the magnetic sector field B is scanned, a mass spectrum of singly charged product ions of doubly charged precursor ions is obtained. MS MS:1000321