Here is the electron-impact ionization cross section for Ammonia (NH3) from 5 eV to 1000 eV.

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T=5 to 1000 eV T=5 to 100 eV T=50 to 250 eV T=250 to 1000 eV

Legend (below)

Data setSource
BEBBEB (vertical IP)
Y.-K. Kim, W. Hwang, N. M. Weinberger, M. A. Ali and M.E. Rudd, J. Chem. Phys. 106, 1026 (1997).
Theory #1BEB (adiabatic IP)
W. Hwang, Y.-K. Kim and M.E. Rudd, J. Chem. Phys. 104, 2956 (1996).
Experiment #1N. Djuric, D. Belic, M. Kurepa, J. U. Mack, J. Rothleitner and T. D. Märk, Abstracts, 12th Int. Conf. on the Physics of Atomic and Electronic Collisions, ed. by S. Datz (Gatlinburg, 1981), p. 384.
Experiment #2M. V. V. S. Rao and S. K. Srivastava, J. Phys. B 25, 2175 (1992).

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