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Precision spectroscopy and density-dependent frequency shifts in ultracold Sr

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arxiv physics/0410110 v2 pith:JOQFBNHH submitted 2004-10-15 physics.atom-ph physics.optics

Precision spectroscopy and density-dependent frequency shifts in ultracold Sr

classification physics.atom-ph physics.optics
keywords frequencyclockmeasurementopticaltransitionultracoldaccurateaddition
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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abstract

By varying the density of an ultracold $^{88}$Sr sample from $10^9$ cm$^{-3}$ to $> 10^{12}$ cm$^{-3}$, we make the first definitive measurement of the density-related frequency shift and linewidth broadening of the $^1S_0$ - $^3P_1$ optical clock transition in an alkaline earth system. In addition, we report the most accurate measurement to date of the $^{88}$Sr $^1S_0 - ^3P_1$ optical clock transition frequency. Including a detailed analysis of systematic errors, the frequency is ($434 829 121 312 334 \pm 20_{stat} \pm 33_{sys}$) Hz.

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