  The phenomenon of charged-particle oscillation in DC voltage biased
plane-parallel conductors is discussed. Traditionally accepted mechanism for
explaining the oscillatory behavior of charged particles in such system
attributes the phenomenon to a process of charge exchange, which takes place
when charged-particle is in close proximity to one of the electrodes. A novel
finding here reveals that for microscopic or smaller particles under special
circumstances, charged-particle oscillation does not involve charge exchanges.
Such system radiates and the frequency of emitted radiation is controlled by a
DC voltage biased across the two plane-parallel electrodes.
