Collisional Properties of Cold Spin-Polarized Nitrogen Gas: Theory, Experiment, and Prospects as a Sympathetic Coolant for Trapped Atoms and Molecules

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Collisional Properties of Cold Spin-Polarized Nitrogen Gas: Theory, Experiment, and Prospects as a Sympathetic Coolant for Trapped Atoms and Molecules

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dc.contributor.author Tscherbul, Timur V.
dc.contributor.author Dalgarno, Alexander
dc.contributor.author Klos, Jacek
dc.contributor.author Zygelman, Bernard
dc.contributor.author Pavlovic, Zoran
dc.contributor.author Hummon, Matthew T.
dc.contributor.author Lu, Hsin-I
dc.contributor.author Doyle, John M.
dc.contributor.author Tsikata, Edem
dc.date.accessioned 2011-09-22T20:22:06Z
dc.date.issued 2010
dc.identifier.citation Tscherbul, Timur V., Jacek Klos, Alexander Dalgarno, Bernard Zygelman, Zoran Pavlovic, Matthew T. Hummon, Hsin-I Lu, Edem Tsikata, and John M. Doyle. 2010. Collisional properties of cold spin-polarized nitrogen gas: Theory, experiment, and prospects as a sympathetic coolant for trapped atoms and molecules. Physical Review A 82(4): 042718. en_US
dc.identifier.issn 1050-2947 en_US
dc.identifier.uri http://nrs.harvard.edu/urn-3:HUL.InstRepos:5139187
dc.description.abstract We report a combined experimental and theoretical study of collision-induced dipolar relaxation in a cold spin-polarized gas of atomic nitrogen (N). We use buffer gas cooling to create trapped samples of \(^{14}\)N and \(^{15}\)N atoms with densities (5\(\pm\)2) × \(10^{12}\) \(cm^{-3}\) and measure their magnetic relaxation rates at milli-Kelvin temperatures. These measurements, together with rigorous quantum scattering calculations based on accurate \(ab\) \(initio\) interaction potentials for the \(^{7}\Sigma^{+}_{u}\) electronic state of \(N_{2}\) demonstrate that dipolar relaxation in N+N collisions occurs at a slow rate of ~\(10^{-13}\) \(cm^{3}\)/s over a wide range of temperatures (1 mK to 1 K) and magnetic fields (10 mT to 2 T). The calculated dipolar relaxation rates are insensitive to small variations of the interaction potential and to the magnitude of the spin-exchange interaction, enabling the accurate calibration of the measured N atom density. We find consistency between the calculated and experimentally determined rates. Our results suggest that N atoms are promising candidates for future experiments on sympathetic cooling of molecules. en_US
dc.description.sponsorship Astronomy en_US
dc.language.iso en_US en_US
dc.publisher American Physical Society en_US
dc.relation.isversionof doi:10.1103/PhysRevA.82.042718 en_US
dc.relation.hasversion http://arxiv.org/abs/1007.0469 en_US
dash.license LAA
dc.title Collisional Properties of Cold Spin-Polarized Nitrogen Gas: Theory, Experiment, and Prospects as a Sympathetic Coolant for Trapped Atoms and Molecules en_US
dc.type Journal Article en_US
dc.description.version Version of Record en_US
dc.relation.journal Physical Review A en_US
dash.depositing.author Dalgarno, Alexander
dc.date.available 2011-09-22T20:22:06Z

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  • FAS Scholarly Articles [6929]
    Peer reviewed scholarly articles from the Faculty of Arts and Sciences of Harvard University

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