Here is the electron-impact ionization cross section for Water (H2O) 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
Y.-K. Kim and M.E. Rudd, Phys. Rev. A 50, 3954 (1994); W. Hwang, Y.-K. Kim and M.E. Rudd, J. Chem. Phys. 104, 2956 (1996); and Y.-K. Kim and M.E. Rudd, Comments At. Mol. Phys. 34, 293 (1999).
Experiment #1N. Lj. Duric, I. M. Cadez, and M. V. Kurepa, Int. J. Mass. Spectrom. Ion Processes 83, R7 (1988).
Experiment #2J. Schutten, F. J. de Heer, H. R. Moustafa, A. J. H. Boerboom and J. Kistenmaker, J. Chem. Phys. 44, 3924 (1966).
Experiment #3M. A. Bolorizadeh and M. E. Rudd, Phys. Rev. A 33, 882 (1985).
Experiment #4M. V. V. S. Rao, I. Iga and S. K. Srivastava, J. Geophys. Res. 100, 26421 (1995).
Experiment #5S. P. Khare and W. J. Meath, J. Phys. B 20, 2101 (1987), and references therein (theory).
Experiment #6H. C. Straub, B. G. Lindsay, K. A. Smith, and R. F. Stebbings, J. Chem. Phys. 108, 109 (1998).

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