The Velocity Distribution of Secondary Electrons from a molybdenum

Abstract

The velocity distribution curves of secondary electrons from a molybdenum target for primary electron velocities from 7.5 to 100 volts are obtained by an improved apparatus, using the magnetic deflection method. Distribution curves quite similar to those observed by others for different metals are obtained, showing a broad low-velocity maximum of secondary electrons and a sharp "reflected" peak whose measured velocity in all cases turned out to be approximately 2 volts less than the corresponding accelerating voltage. It is shown that this should be so, from a consideration of contact potentials.