In order to obtain high efficiensy in analyzing energy of electrons, a gate type TOF electron energy analyzer has been developed. In this system, ejected electrons are chopped by a electric field which works as a gate, and the electron energy is analyzed by TOF method. Since this gate works not only in single pulsed mode, but also in the cross-correlation TOF mode, thisanalyzer has a potential to reach ultimate efficiency. A TOF spectrum of electrons emitted from the reaction of Ar + He* → Ar+ + He + e- is demonstrated for the first time. |