If the magnetic moment of a dioxygen species is 1.73B.M.Then the ion may be

$$\begin{gathered} 1.73=\sqrt{n(n+2)}n=1, \\ {O}_2^{+}=\sigma 1S^2{\sigma }^{\ast }1S^2\sigma 2S^2{\sigma }^2{S}^2\sigma 2P_2^2\pi 2P_x^2 \end{gathered}$$ 
$$\begin{gathered} =\pi 2P_y^2{\pi }^{\ast }2P_x^1={\pi }^{\ast }2P_y^0, \\ {O}_2^{-}=\sigma 1S^2{\sigma }^{\ast }1S^2\sigma 2S^2{\sigma }^{\ast }2S^2\sigma 2P_2^2\pi 2P_x^2 \end{gathered}$$ 
$=\pi 2P_y^2{\pi }^{\ast }2P_x^2={\pi }^{\ast }2P_y^1$