Abstract
Narrow bandwidth laser excitation of the 2 3S 1 → 2 3P J ( J = 0,1,2) transitions near 5485 Å from 2 3S 1 Li + ions confined in an rf quadrupole trap has produced novel fluorescence response curves (fluorescence versus laser frequency) characteristic of optical pumping in the absence of strong hyperfine relaxation. The 2 3S 1 → 2 3P 2,1 transitions in 7Li + were extensively studied. The observations are consistent with predictions of a rate equation model which treats the ions as a gas in temperature equilibrium. A narrow bandwidth pumping source (linewidth < Doppler width and hyperfine splittings) produces a response curve narrower than the Doppler blended hyperfine complex. Frequency scanning elicits hysteresis effects when the scan rate exceeds the response rate of the pumped ions.
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