Publication Date:
2009-04-18
Description:
At ultracold temperatures, the Pauli exclusion principle suppresses collisions between identical fermions. This has motivated the development of atomic clocks with fermionic isotopes. However, by probing an optical clock transition with thousands of lattice-confined, ultracold fermionic strontium atoms, we observed density-dependent collisional frequency shifts. These collision effects were measured systematically and are supported by a theoretical description attributing them to inhomogeneities in the probe excitation process that render the atoms distinguishable. This work also yields insights for zeroing the clock density shift.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Campbell, G K -- Boyd, M M -- Thomsen, J W -- Martin, M J -- Blatt, S -- Swallows, M D -- Nicholson, T L -- Fortier, T -- Oates, C W -- Diddams, S A -- Lemke, N D -- Naidon, P -- Julienne, P -- Ye, Jun -- Ludlow, A D -- New York, N.Y. -- Science. 2009 Apr 17;324(5925):360-3. doi: 10.1126/science.1169724.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉JILA, National Institute of Standards and Technology and University of Colorado Department of Physics, University of Colorado, Boulder, CO 80309-0440, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19372424" target="_blank"〉PubMed〈/a〉
Print ISSN:
0036-8075
Electronic ISSN:
1095-9203
Topics:
Biology
,
Chemistry and Pharmacology
,
Computer Science
,
Medicine
,
Natural Sciences in General
,
Physics
