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First Optical Hyperfine Structure Measurement in an Atomic Anion

A. Fischer, C. Canali, U. Warring, A. Kellerbauer, and S. Fritzsche
Phys. Rev. Lett. 104, 073004 – Published 18 February 2010

Abstract

We have investigated the hyperfine structure of the transition between the 5d76s2 F9/2e4 ground state and the 5d66s26p DJo6 excited state in the negative osmium ion by high-resolution collinear laser spectroscopy. This transition is unique because it is the only known electric-dipole transition in atomic anions and might be amenable to laser cooling. From the observed hyperfine structure in Os187 and Os189 the yet unknown total angular momentum of the bound excited state was found to be J=9/2. The hyperfine structure constants of the F9/2e4 ground state and the D9/2o6 excited state were determined experimentally and compared to multiconfiguration Dirac-Fock calculations. Using the knowledge of the ground and excited state angular momenta, the full energy level diagram of Os192 in an external magnetic field was calculated, revealing possible laser cooling transitions.

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  • Received 17 December 2009

DOI:https://doi.org/10.1103/PhysRevLett.104.073004

©2010 American Physical Society

Authors & Affiliations

A. Fischer, C. Canali, U. Warring, and A. Kellerbauer*

  • Max Planck Institute for Nuclear Physics, Saupfercheckweg 1, 69117 Heidelberg, Germany

S. Fritzsche

  • GSI Helmholtzzentrum für Schwerionenforschung GmbH, Planckstraße 1, 64291 Darmstadt, Germany

  • *To whom correspondence should be addressed. a.kellerbauer@mpi-hd.mpg.de
  • Also at: Department of Physical Sciences, P.O. Box 3000, 90014 University of Oulu, Finland.

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Issue

Vol. 104, Iss. 7 — 19 February 2010

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