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Cold and ultracold collisions of MgH (2Σ+) with helium

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  • Atomic and Molecular Collisions
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Abstract

The cross sections for rotational, fine-structure and projection-change transitions in collision of MgH (2Σ+) molecule with 3He and 4He atoms were computed at cold and ultracold temperatures using the ab initio potential energy surface. The significant suppression feature and resonance pattern caused by spin-rotation interaction were found and discussed. The collisions exhibit a strong isotope effect in the ultracold regime. The rotational relaxations of the fine-structure excited energy levels tendentiously preserve the F index. The ratio of the cross sections for elastic and spin-flipping collision with 3He partner is always greater than seven orders of magnitude for the energy range 10-6−1cm-1 and suggests the MgH molecule is a good candidate for 3He buffer gas cooling.

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Authors and Affiliations

  1. Department of Physics, Anhui normal university, Wuhu, 241000, P.R. China

    X. T. Xu, X. Shao, C. H. Yu, C. Y. Sun, W. Huang & E. Feng

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  1. X. T. Xu
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  2. X. Shao
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  3. C. H. Yu
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  4. C. Y. Sun
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  6. E. Feng
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Correspondence to E. Feng.

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Xu, X.T., Shao, X., Yu, C.H. et al. Cold and ultracold collisions of MgH (2Σ+) with helium. Eur. Phys. J. D 65, 383–390 (2011). https://doi.org/10.1140/epjd/e2011-20104-6

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  • DOI: https://doi.org/10.1140/epjd/e2011-20104-6

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