Very-high-resolution energy analyser for electron beams

The authors designed an energy analyser for electron beams which exploits the retarding potential method over a small portion of the beam when all relaxations in the beam have occurred. This permits great improvement of energy resolution with respect to standard devices. The resolution depends on beam energy and is in the range 5-7 meV. The authors applied the energy analyser to determine the temperature dependence of the energy spread for electron beams emitted from GaAs.