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. |
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| dc.contributor.author |
Dalgarno, Alexander
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| dc.contributor.author |
Klos, Jacek |
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Zygelman, Bernard |
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Pavlovic, Zoran |
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Hummon, Matthew T. |
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Lu, Hsin-I
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Doyle, John M.
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| dc.contributor.author |
Tsikata, Edem |
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| dc.date.accessioned |
2011-09-22T20:22:06Z |
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| dc.date.issued |
2010 |
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| 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 |
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| dc.identifier.uri |
http://nrs.harvard.edu/urn-3:HUL.InstRepos:5139187 |
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| 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. |
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| dc.description.sponsorship |
Astronomy |
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| dc.language.iso |
en_US |
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| dc.publisher |
American Physical Society |
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| 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 |
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| 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
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| dc.date.available |
2011-09-22T20:22:06Z |
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Peer reviewed scholarly articles from the Faculty of Arts and Sciences of Harvard University
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