text: Klystrons are primarily used as sources of this phenomenon, which is used to stimulate transitions created by the Zeeman effect in electron spin resonance.
full_question: Klystrons are primarily used as sources of this phenomenon, which is used to stimulate transitions created by the Zeeman effect in electron spin resonance. Cavity magnetrons produce this phenomenon. OH and CH radicals in molecular clouds serve as sources of this kind of radiation from space. Charles Townes invented a device which uses rotational transitions in molecules of ammonia to produce a coherent beam of this kind of radiation via stimulated emission. Molecules with a high dipole moment, such as water, are excellent absorbers of this kind of radiation, allowing this radiation to be used in dielectric heating. For 10 points--name this radiation with wavelengths between infrared and radio waves used to efficiently reheat food.
first_sentence: Klystrons are primarily used as sources of this phenomenon, which is used to stimulate transitions created by the Zeeman effect in electron spin resonance.