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Zeeman relaxation of cold atomic iron and nickel in collisions with [superscript 3] He

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Show simple item record Johnson, Cort Newman, Bonna Kay Brahms, Nathan Doyle, John M. Greytak, Thomas J. Kleppner, Daniel 2011-02-09T15:48:42Z 2011-02-09T15:48:42Z 2010-06 2010-03
dc.identifier.issn 1050-2947
dc.identifier.issn 1094-1622
dc.description.abstract We have measured the ratio γ of the diffusion cross section to the angular momentum reorientation cross section in the colliding Fe-3He and Ni-3He systems. Nickel (Ni) and iron (Fe) atoms are introduced via laser ablation into a cryogenically cooled experimental cell containing cold (<1 K) 3He buffer gas. Elastic collisions rapidly cool the translational temperature of the ablated atoms to the 3He temperature. γ is extracted by measuring the decays of the atomic Zeeman sublevels. For our experimental conditions, thermal energy is comparable to the Zeeman splitting. As a result, thermal excitations between Zeeman sublevels significantly impact the observed decay. To determine γ accurately, we introduce a model of Zeeman-state dynamics that includes thermal excitations. We find γNi-3He=5×103 and γFe-3He3[greater than and equal to]×103 at 0.75 K in a 0.8-T magnetic field. These measurements are interpreted in the context of submerged shell suppression of spin relaxation, as studied previously in transition metals and rare-earth-metal atoms [C. I. Hancox, S. C. Doret, M. T. Hummon, R. V. Krems, and J. M. Doyle, Phys. Rev. Lett. 94, 013201 (2005); C. I. Hancox, S. C. Doret, M. T. Hummon, L. Luo, and J. M. Doyle, Nature (London) 431, 281 (2004); A. Buchachenko, G. Chaasiski, and M. Szczniak, Eur. Phys. J. D 45, 147 (2007)]. en_US
dc.description.sponsorship National Science Foundation (U.S.) en_US
dc.description.sponsorship United States. Office of Naval Research en_US
dc.description.sponsorship MIT-Harvard Center for Ultracold Atoms en_US
dc.language.iso en_US
dc.publisher American Physical Society en_US
dc.relation.isversionof en_US
dc.rights Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. en_US
dc.source APS en_US
dc.title Zeeman relaxation of cold atomic iron and nickel in collisions with [superscript 3] He en_US
dc.title.alternative Zeeman relaxation of cold atomic iron and nickel in collisions with He3 en_US
dc.type Article en_US
dc.identifier.citation Johnson, Cort et al. “Zeeman relaxation of cold atomic iron and nickel in collisions with^{3}He.” Physical Review A 81.6 (2010): 062706. © 2010 The American Physical Society. en_US
dc.contributor.department Massachusetts Institute of Technology. Department of Physics en_US
dc.contributor.department Harvard-MIT Center for Ultracold Atoms en_US
dc.contributor.department Massachusetts Institute of Technology. Research Laboratory of Electronics en_US
dc.contributor.approver Greytak, Thomas J.
dc.contributor.mitauthor Johnson, Cort
dc.contributor.mitauthor Newman, Bonna Kay
dc.contributor.mitauthor Brahms, Nathan
dc.contributor.mitauthor Doyle, John M.
dc.contributor.mitauthor Greytak, Thomas J.
dc.contributor.mitauthor Kleppner, Daniel
dc.relation.journal Physical Review A en_US
dc.identifier.mitlicense PUBLISHER_POLICY en_US
dc.eprint.version Final published version en_US
dc.type.uri en_US
eprint.status en_US
dspace.orderedauthors Johnson, Cort; Newman, Bonna; Brahms, Nathan; Doyle, John; Kleppner, Daniel; Greytak, Thomas en

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