The Focusing in Crossed Fields of Charged Particles at Relativistic Energies

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Abstract
The motion of charged particles traveling with relativistic energies in a uniform magnetic field superimposed at right angles to the electric field of a cylindrical condenser has been investigated. Expressions for the angle at which first-order focusing of a divergent beam of particles occurs and first approximations to the line breadth as well as dispersion in velocity, momentum, and energy are given.