Rotational cooling of HD+ molecular ions by superelastic collisions with electrons.

2009: SAltevogt; HBuhr; AFauré; MGrieser; AGHarvey; OHeber; JHoffmann; HKreckel; LLammich; INevo; SNovotny; HBPedersen; HRubinstein; IFSchneider; DSchwalm; DShafir; JTennyson; AWolf; DZajfman;

Phys Rev Lett.2009;102(22):223202.

NLM PMID: 19658863

Article abstract

Merging an HD+ beam with velocity matched electrons in a heavy ion storage ring we observed rapid cooling of the rotational excitations of the HD+ ions by superelastic collisions (SEC) with the electrons. The cooling process is well described using theoretical SEC rate coefficients obtained by combining the molecular R-matrix approach with the adiabatic nuclei rotation approximation. We verify the DeltaJ=-2 SEC rate coefficients, which are predicted to be dominant as opposed to the DeltaJ=-1 rates and to amount to (1-2)x10;{-6} cm;{3} s;{-1} for initial angular momentum states with J< or =7, to within 30%.

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Last MEDLINE®/PubMed® update: 1st of December 2015