Here is the electron-impact ionization cross section for Oxygen molecule (O2) from 5 eV to 2000 eV.

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T=5 to 2000 eV T=5 to 100 eV T=50 to 250 eV T=250 to 2000 eV

Legend (below)

Data setSource
W. Hwang, Y.-K. Kim and M.E. Rudd, J. Chem. Phys. 104, 2956 (1996).
Experiment #1D. Rapp and P. Englander-Golden, J. Chem. Phys. 43, 1464 (1965).
Experiment #2B. L. Schram, F. J. de Heer, M. J. van der Wiel and J. Kistenmaker, Physica 31, 94 (1965).
Experiment #3B. L. Schram, H. R. Moustafa, J. Schutten and F. J. de Heer, Physica 32, 734 (1966).
Experiment #4E. Krishnakumar and S. K. Srivastava, Int. J. Mass. Spectrom. Ion Processes 113, 1 (1992).

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