Phys. Rev. Lett. 100, 123001 (2008) [4 pages]Hyperfine-Structure-Induced Purely Long-Range MoleculesReceived 18 July 2007; published 24 March 2008 We have experimentally observed and theoretically identified a novel class of purely long-range molecules. This novel purely long-range state is formed due to a very weak hyperfine interaction that is usually treated only as a small perturbation in molecular spectra. Photoassociation spectroscopy of ultracold ytterbium (171Yb) atoms with the 1S0-3P1 intercombination transition presents clear identification of molecular states and the shallowest molecular potential depth of about 750 MHz among the purely long-range molecules ever observed. © 2008 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.100.123001
DOI:
10.1103/PhysRevLett.100.123001
PACS:
33.15.Pw, 34.20.Cf, 37.10.De
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