Clock to Rydberg state transition measurement in a neutral strontium atom cloud

We present a proposal of determination of the density shift of the1S0-3P0clock transition in neutral cold strontium atoms. Since the direct use of the double forbidden, intercombination clock transition (698 nm) may be difficult we propose to use a three photon photoassociation. The measurement will be performed with the magneto-optical trap set-up designed for the experiments with both88Sr and87Sr isotopes.

Joint Conference of the European Frequency and Time Forum and IEEE International Frequency Control Symposium (EFTF/IFCS)Jul 1, 20130 citations

Clock to Rydberg state transition measurement in a neutral strontium atom cloud

Hamers, Carolus G.H.P.

Published Aug 1, 2025• 0 citations

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Clouds of ultracold strontium

5s48s\phantom{\rule{4pt}{0ex}}{}^{1}{S}_{0}

5s47d\phantom{\rule{4pt}{0ex}}{}^{1}{D}_{2}

Rydberg atoms are created by two-photon excitation of laser-cooled

5{s}^{2}\phantom{\rule{4pt}{0ex}}{}^{1}{S}_{0}

atoms. The spontaneous evolution of the cloud of low orbital angular momentum (low-$\ensuremath{\ell}$) Rydberg states towards an ultracold neutral plasma is observed by imaging resonant light scattered from core ions, a technique that provides both spatial and temporal resolution. Evolution is observed to be faster for the

S

states, which display isotropic attractive interactions, than for the

D

states, which exhibit anisotropic, principally repulsive interactions. Immersion of the atoms in a dilute ultracold neutral plasma speeds up the evolution and allows the number of Rydberg atoms initially created to be determined.