The theory of adiabatic rapid passage and the first applications were used in the study of nuclear magnetic moments. This study extends the results to electron spin resonance systems with emphasis on ionic paramagnets. The theory of adiabatic rapid passage is shown to apply to any two-level quantum system under the appropriate conditions. Interactions with other quantum levels and interactions not taken account of in the simple theory developed are then described by phenomenological relaxation times. It is shown that the only significant relaxation time in adiabatic rapid passage experiments is the spin-lattice relaxation time;several types of masers are discussed.
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