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Natural SciencesPhysicsAtomic PhysicsOpticsSpectroscopyAtomic ExcitationAtomic SpectraAtomic SpectroscopyOptical CoherenceOptical Properties Of SolidsOptical SpectroscopyAtom-field InteractionsAtomic Excitation SpectraCoherent ExcitationCrystal OpticsExcitationOptical Absorption SpectraOptical Emission Spectra