Highly correlated electronic bounding and spin effect: Confirmation of an autodetaching state of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msup> <mml:mrow> <mml:mi mathvariant="normal">O</mml:mi> </mml:mrow> <mml:mo>−</mml:mo> </

The existence of an autodetaching state of ${\mathrm{O}}^{\ensuremath{-}}$ with a lifetime on the scale of 100 ns is demonstrated both experimentally and theoretically. The ${\mathrm{O}}^{\ensuremath{-}}$ lifetime values are determined using two recently developed methods. The experimental approach is based on a derivation from measured electron-loss cross sections combined with time-of-flight spectrometry. For the theoretical approach, the continued Green's function within the formalism of Fano-Feshbach is applied. We present the measured lifetime value of $100\ifmmode\pm\else\textpm\fi{}10\phantom{\rule{4.pt}{0ex}}\text{ns}$. The calculated lifetime value is 75 ns, and is associated with the ($2{p}^{3}3{s}^{2}){\phantom{\rule{0.16em}{0ex}}}^{4}S$ state of ${\mathrm{O}}^{\ensuremath{-}}$. We discuss how the existence of a 100-ns-lifetime oxygen metastable anion can impact the modeling of oxygen-containing systems.