mass spectrum electron ionisation mass spectrum electron impact mass spectra EI mass spectra A plot of relative abundance (%) vs. mass-to-charge ratio obtained from a mass spectrometry experiment where the sample is ionised by electrons (energy 70 eV) which have been emitted from a glowing filament and accelerated through an electric field. EI mass spectrum electron ionization mass spectra 2009-09-16T09:14:21Z electron impact mass spectrum https://orcid.org/0000-0001-5985-7429 CHMO:0002392 electron impact (EI+) mass spectra EI-MS spectrum EI-MS spectra electron ionization mass spectrum