Cj. Mckinstrie et Ej. Turano, NONRELATIVISTIC MOTION OF A CHARGED-PARTICLE IN AN ELECTROMAGNETIC-FIELD, Journal of Plasma Physics, 59, 1998, pp. 555-560
The nonrelativistic motion of a charged particle in the electromagneti
c field of a plane wave is studied. New analytic solutions of the equa
tion of motion are found that manifest the dependence of the period of
the particle motion on the wave amplitude.