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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