Ratio of electron-impact ionization to OI 1356 Å dissociative excitation of O$_2$ and their cross sections

This dataset provides most recent measured cross sections of electron-impact ionization and OI 1356 Å dissociative excitation of O$_2$ and extrapolations as well as the ionization-to-excitation ratio for electrons with Maxwell energy distributions as collected or calculated in Duling et al. (2026) (Figure 1). Cross Sections The file cross_sections.txt contains measured or extrapolated cross sections for electron-impact ionization of O$_2$, OI 1356 Å dissociative excitation of O$_2$ and OI 1356 Å excitation of O as function of electron energy $W_e$ in the range 10$^1$-10$^5$ eV. Measured cross sections are linearly interpolated. For higher energies the measured cross sections are extrapolated using Bethe-Oppenheimer relations $AW_e^{-1} \ln\left(BW_e\right)$. The cross sections are total cross sections, meaning excitation interactions that excite to higher states than $^5S$ (1356 Å emission) but cascade to $^5S$ are included. The ionization cross sections include ionization interactions that produce (1) O$_2^+$, (2) O$^+$ + O$_2^{++}$ and (3) O$^{++}$. The measured cross sections are combined from the following publications: electron-impact ionization of O$_2$: $W_e\le$1000 eV Lindsay & Mangan (2003) (modified data from Straub et al. (1996))1000 eV $ $20000 eV extrapolation using the 600 eV $\le W_e\le$20000 eV data from Schram et al. (1965). OI 1356 Å dissociative excitation of O$_2$: $W_e\le$600 eV Kanik et al. (2003)$W_e>$600 eV extrapolation using the $W_e>$100 eV data from Kanik et al. (2003). OI 1356 Å excitation of O: 13 eV $