Experiments on negative ion production by the electron capture process in an ion cyclotron resonance (ICR) mass spectrometer indicate that secondary electrons are responsible for the ionization observed at a primary electron beam energy of 70 eV.
T. McAllister, J. Chem. Soc., Chem. Commun., 1972, 245 DOI: 10.1039/C39720000245
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