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Phys Rev Lett. 2004 Mar 19;92(11):110801. Epub 2004 Mar 18.

Intense, narrow atomic-clock resonances.

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1
Department of Physics, Princeton University, Princeton, New Jersey 08544, USA.

Abstract

We present experimental and theoretical results showing that magnetic resonance transitions from the "end" sublevels of maximum or minimum spin in alkali-metal vapors are a promising alternative to the conventional 0-0 transition for small-size gas-cell atomic clocks. For these "end resonances," collisional spin-exchange broadening, which often dominates the linewidth of the 0-0 resonance, decreases with increasing spin polarization and vanishes for 100% polarization. The end resonances also have much stronger signals than the 0-0 resonance, and are readily detectable in cells with high buffer-gas pressure.

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