Coherent radiation from neutral molecules moving above a grating
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The effect of parametric self-induced excitation of a molecule moving above the dielectric or conducting medium with periodic grating was studied. One more fundamental effect which was the parametric self-excitation of dipole oscillations of a molecule moving close to a periodic grating was observed. This effect can be experimentally observed in different ways and can even be employed for amplification and generation of coherent radiation in the far-infrared (IR) to microwave ranges.