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The high resolution double focusing mass spectrometer of reversed NierJohnson geometry was used in research of ionization and fragmentation processes of ethanol molecules C2H5OH. Using the mass-analyzed ion kinetic energy technique, fragmentation paths and kinetic energy release distributions were examined for the four fragmentation reactions: C2H6O

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Ionmolecule reactions have been measured for the propeneargon mixtures of dierent compositions using a quadrupole mass spectrometer with a high-pressure ion source. The concentration of propane in these mixtures ranged from 10% to 90% (at 10% increment). The following primary and secondary ions: CH Relative ion current intensities for primary and secondary ions are presented as a function of both total mixtures pressure and concentration of propene in the mixture. Primary ions were produced by electrons with the energy of 300 eV. The potential of repeller electrode VR inside the ion source collision chamber was xed at 5 V for all measurements. The total mixture pressure was changed from 0.7 to 26.6 Pa. Schemes of ionmolecule reactions were proposed.