Optical double resonance experiments
This chapter explains the excitation of atoms by polarized resonance radiation and their interaction with static and radio-frequency fields, known as optical double-resonance. The Brossel-Bitter experiment on mercury vapour is discussed and classical and quantum mechanical theories of the effect are developed. The phenomena of radiation trapping and coherence narrowing are explained, and the effect of collision broadening is examined. Experiments involving intensity-modulated light are reported, and the density matrix formulation of optical double-resonance experiments is developed.
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