The sensitivity of the mass spectrometer towards RHgX alkylmercury halides in the electron impact technique was found to decrease in the order X = Cl > Br > I. The intense peaks corresponding to the more heavy halides registered in the mass spectra of RHgX were shown to arise owing to the secondary processes of halogen exchange occurring in the mass spectrometer. The non‐volatile bromine and iodine compounds adsorbed in some form on metallic surfaces of the ionization chamber (so‐called ‘memory effect’) could be the source of heavy halogens. These reactions are hampered in chemical ionization mass spectrometry under the sufficiently high pressure of the reagent gas (NH3).
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