Ab initio calculations of external-field shifts of the 661-nm quadrupolar clock transition in neutral Ag atoms

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Suat Topcu and Jamil Nasser
Laboratoire LIS Versailles, 45 Avenue des États-Unis 78035 Versailles, France

Latévi Max Lawson Daku
Université de Genève, Sciences II, CH-1211 Genève 4, Switzerland

Stephan Fritzsche
Institute für Physik, Universität Kassel, Heinrich-Plett-Str. 40, D-34132 Kassel, Germany

Received 8 February 2006; published 11 April 2006

Frequencyshifts of the Ag I 4d¹⁰5s ²S_1/2(F=0,M_F=0) to 4d⁹5s² ²D_5/2(F=2,M_F=0) electric-quadrupole transition at 330.6 nmdue to external fields are calculated using multiconfigurational self-consistent fieldmethods. As this forbidden transition is free from first orderDoppler and Zeeman effects, it is under investigation for therealization of an atomic optical clock. The calculated perturbations arethe light shift, the blackbody frequency shift, and the quadraticZeeman shift. Results show that a total uncertainty of 10^–18could be reach without confining the atoms in a Lamb-Dickeregime in an optical lattice.

URL:	http://link.aps.org/doi/10.1103/PhysRevA.73.042503
DOI:	10.1103/PhysRevA.73.042503
PACS:	31.15.Ar; 06.30.Ft; 32.60.+i; 32.80.Pj 31.15.Ar Ab initio calculations (atoms and molecules) 06.30.Ft Time and frequency measurement 32.60.+i Zeeman and Stark effects in atoms 32.80.Pj Optical cooling of atoms; trapping YEAR: 2006
KEYWORDS:	ab initio calculations, silver, SCF calculations, Doppler shift, Zeeman effect, atom optics, atomic clocks

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