Traps for Neutral Atoms
Annual summary rept. 1 Sep 1987-31 Aug 1988
MASSACHUSETTS INST OF TECH CAMBRIDGE RESEARCH LAB OF ELECTRONICS
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We have concentrated on radio frequency resonance experiments on magnetically trapped neutral atoms. R.F. resonance of trapped atoms is valuable for at least three reasons as a high resolution diagnostic of the atoms individual and collective behavior, as a tool to selectively manipulate the magnetic quantum states of the trapped atoms, and potentially for ultra-high resolution spectroscopy of isolated atomic systems. Following the successful demonstration of r.f. induced transitions on trapped neutral atoms, we proceeded to increase the number approx. x 10 to the 10th power and confinement time tau sub 1e 30 minutes of trapped sodium atoms so that we had sufficient signal to time to perform r.f. resonance measurements as a diagnostic of the effects of doppler cooling on the atoms energy distribution. An r.f. resonance curve for a hyperfine transition was obtained by measuring the relative peak heights of the fluoresence spectrum for the two states as function of the frequency of the applied r.f. r.f. resonance curve for hot atoms after initial loading of the trap were much wider than that of cool atoms after application of longitudinal doppler cooling. We found that doppler cooling of the sample required a very weak standing wave laser beam to avoid excess heating of the transverse degree of freedom.
- Physical Chemistry
- Radiation and Nuclear Chemistry