Mechanism of Collisional Spin Relaxation in \(^3\)Σ Molecules

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Mechanism of Collisional Spin Relaxation in \(^3\)Σ Molecules

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Title: Mechanism of Collisional Spin Relaxation in \(^3\)Σ Molecules
Author: Campbell, Wesley C.; Tscherbul, Timur V.; Lu, Hsin-I; Tsikata, Edem; Krems, Roman V.; Doyle, John M.

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Citation: Campbell, Wesley C., Timur V. Tscherbul, Hsin-I Lu, Edem Tsikata, Roman V. Krems, and John M. Doyle. 2009. Mechanism of collisional spin relaxation in \(^3\)Σ molecules. Physical Review Letters 102(1): 013003.
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Abstract: We measure and theoretically determine the effect of molecular rotational splitting on Zeeman relaxation rates in collisions of cold \(^3\)Σ molecules with helium atoms in a magnetic field. All four stable isotopomers of the imidogen (NH) molecule are magnetically trapped and studied in collisions with \(^3\)He and \(^4\)He. The \(^4\)He data support the predicted 1/B\(^{2}_{e}\) dependence of the collision-induced Zeeman relaxation rate coefficient on the molecular rotational constant B\(_e\). The measured \(^3\)He rate coefficients are much larger than the \(^4\)He coefficients, depend less strongly on B\(_e\), and theoretical analysis indicates they are strongly affected by a shape resonance. The results demonstrate the influence of molecular structure on collisional energy transfer at low temperatures.
Published Version: doi:10.1103/PhysRevLett.102.013003
Other Sources: http://arxiv.org/PS_cache/arxiv/pdf/0804/0804.0265v2.pdf
Terms of Use: This article is made available under the terms and conditions applicable to Other Posted Material, as set forth at http://nrs.harvard.edu/urn-3:HUL.InstRepos:dash.current.terms-of-use#LAA
Citable link to this page: http://nrs.harvard.edu/urn-3:HUL.InstRepos:5349606
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