electron-impact ionization
electron-impact ionization cross section
electron-impact ionization of the inner subshell electrons of Na-like ions
gas chromatography-electron impact ionization mass
ionization by electron impact
electron electron interactions
electron electron scattering
electron impact at intermediate and high energies
electron impact desorption
Electron impact excitation
electron impact ion source
electron impact mass spectra
electron impact mass spectra EI-MS
Electron Impact Mass Spectrometry
electron impact spectroscopy