Abstract
The feasibility of direct determination of optical oscillator strengths in free atoms and ions has been investigated using two-step laser excitation in a collinear fast-beam geometry. Experimental results obtained in the uranium ion are analyzed within the density-matrix formalism. A Rabi frequency Ω = 5.8 ± 0.8 MHz is found for the 17 434J=11/2–34 634J=11/2 transition in 238U ii, corresponding to an oscillator strength f = 8.6 × 10−4 ± 3.3 × 10−4 for this transition.
© 1985 Optical Society of America
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