Ion‐molecule studies of energetic oxygen allotropes in flow tubes: O2(v),O2(aΔg1),O3,andO ${{\rm{O}}}_{2}({\rm{v}}),{{\rm{O}}}_{2}({\rm{a}}{}^{1}{\rm{\Delta }}_{{\rm{g}}}),{{\rm{O}}}_{3},\mathrm{and}{\rm{O}}$

Abstract Starting in the 1960s, flow tube apparatuses have played a central role in the study of ion‐molecule kinetics, allowing for immense chemical diversity of cationic, anionic, and neutral reactants. Here, we review studies of oxygen allotropes, excluding ground state O 2 (), and focusing instead on reactions of cations, anions, and metal chemi‐ionization reactions with ground state atomic oxygen (O 3 P), vibrationally excited molecular oxygen (O 2 (v)), electronically excited molecular oxygen (O 2 ()), and ozone (O 3 ). Historical outlines of work over several decades are given along with a focus on more recent work by our group at the Air Force Research Laboratory.