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The properties of the least-bound vibrational level (v=14) of the quintetsigma state formed during the ultracold collision of two spin-polarizedmetastable helium atoms are crucial to studies of photoassociation spectroscopyof metastable helium. We report a calculation of the autoionization lifetime ofthis state induced by spin-dipole coupling of the quintet sigma state to thesinglet sigma state from which Penning and associative ionization processes arehighly probable. We find a lifetime of about 150 microseconds, significantlylarger than the recent experimental estimates of (4-5) microseconds.Comment: REVTEX4, four double-column page

physical review. a, atomic, molecular, and optical physics/physical review, a, atomic, molecular, and optical physics

Spin-dipole-induced lifetime of the least-bound<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mi>Σ</mml:mi><mml:mi>g</mml:mi><mml:mo>+</mml:mo><mml:mprescripts /><mml:none /><mml:mn>5</mml:mn></mml:mmultiscripts></mml:mrow></mml:math>state of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>He</mml:mi><mml:mo>(</mml:mo><mml:mn>2</mml:mn><mml:mspace width="0.2em" /><mml:mmultiscripts><mml:mi>S…

Spin-dipole-induced lifetime of the least-boundΣg+5state ofHe(2S…