Spin-dipole-induced lifetime of the least-boundΣg+<mml:mprescripts/><mml:none/>5state ofHe(2<mml:mspace width="0.2em"/>S1<mml:none/><mml:mprescripts/><mml:none/>3)+He(2<mml:mspace width="0.2em"/>S1<mml:none/><mml:mprescripts/><mml:none/>3)

2006/04/24 by Timothy J. Beams, Gillian Peach, G. Peach +1
Physics and Astronomy · #Advanced Chemical Physics Studies #Cold Atom Physics and Bose-Einstein Condensates #Quantum, superfluid, helium dynamics #physics.atom-ph

paper · pdf · doi:10.1103/physreva.74.014702

REVTEX4, four double-column pages

arxiv created 2006/04/24 · openalex publication_date 2006/07/18 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28

Abstract

The properties of the least-bound vibrational level (v=14) of the ⁵\ensuremathΣ_g⁺ state formed during the ultracold collision of two spin-polarized metastable 2\phantom\rule0.2em0ex³S₁ helium atoms are crucial to studies of photoassociation spectroscopy of metastable helium. We report a calculation of the autoionization lifetime \ensuremathτ_g of this state induced by spin-dipole coupling of the ⁵\ensuremathΣ_g⁺ state to the ¹\ensuremathΣ_g⁺ state from which Penning and associative ionization processes are highly probable. We find \ensuremathτ_g\ensuremath≈150\phantom\rule0.3em0ex\mathrm\ensuremathμs, significantly larger than the recent experimental estimates of (0.5\ensuremath-3)\phantom\rule0.3em0ex\mathrm\ensuremathμs.

Citations

• Giant Helium Dimers Produced by Photoassociation of Ultracold Metastable Atoms