New low-energy electron injection systems based on indirectly heated dispenser cathodes facilitate electron capture dissocn. (ECD) in Fourier transform ion cyclotron resonance (FTICR) mass spectrometry. In this joint report, details are presented of the design and performance of these systems on two com. FTICR instruments, 9.4 T Bruker BioAPEX in Uppsala and 4.7 T IonSpec Ultima in Odense. New results include obtaining meaningful one-scan MS/MS data for isolated precursor ions with millisecond irradn. times. The ECD rate improvement is not only due to the larger total electron current, but the larger emitting area as well. [on SciFinder (R)]