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We report the first observation of optical nutation in a collinear fast-ion-beam-laser experiment. 35-keV Ba⁺ ions are suddenly tuned into resonance with a strong laser field by post acceleration over a short distance. The degree of excitation as a function of time is monitored by observing the spontaneously emitted light along the ion beam. Oscillations as a function of transition, laser intensity, and laser frequency detuning have been studied. Theoretical curves have been calculated in the density-matrix formalism.
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Wännström et al. (1988) studied this question.
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