“…Temporary electron-attached states near the continuum threshold have been termed virtual states in s-wave scattering and, while also unbound, are distinct from resonances. 8,9,16,17 Virtual states have been associated with anions in molecules such as CO 2 , 3,18–22 (CN) 2 , 23 Fe(CO) 5 , 24 HCl 25–27 and pyrrole. 28…”