Generation of monochromatic radiation by atomic ions in a magnetic field

In the presence of a magnetic field atomic ions are shown to generate monochromatic radiation with the frequency omega = QB/M, depending on the field strength B and the ion mass M and charge Q. The origin of the effect is the interaction of the bound electrons with the oscillating field of the Stark term coupling the center of mass and electronic motions of an ion due to the nonseparability of the collective and internal degrees of freedom in the system. The intensity of the radiation is defined by the velocities of the ions and the magnetic field strength.