“…Indeed, calculations of the potential energy surfaces for these reactions showed that surfaces of A′ and A″ symmetry are qualitatively different in the entrance channels for all three metals (Armentrout, 2013;Armentrout & Li, 2013;Hinton et al, 2013). For Re + , no low-energy F I G U R E 1 Cross sections for reactions of O 2 with Hf + (red triangles), Ta + (black circles), W + (green inverted triangles) (Hinton et al, 2009), Re + (blue squares) (Armentrout, 2013), Os + (pink diamonds) (Hinton et al, 2013), Ir + (purple triangles) (Armentrout & Li, 2013), Pt + (red inverted triangles) (Zhang & Armentrout, 2003a), Au + ( 1 S) (yellow circles), and Au + ( 3 D) (yellow triangles) (Li et al, 2010) pathways are available along the A′ surfaces, whereas for Os + and Ir + , A″ surfaces have barriers in the entrance channels. At higher kinetic energies, coupling of the A′ and A″ surfaces can occur by electronic-rotational (Coriolis) coupling, as observed for reactions of state-specific rare gas cations (Ar + , Kr + , and Xe + ) with H 2 , D 2 , and HD (Ervin & Armentrout, 1985, 1986a.…”