Mass Spectrometric Study of Positive Ion-Molecule Reactions in the C3H6 and Ar Mixtures Inside the High Pressure Ion Source

A. Markowski, E. Szot and L. Wójcik Institute of Physics, Maria Curie-Skłodowska University, pl. M. Curie-Skłodowskiej 1, 20-031 Lublin, Poland

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Ion-molecule reactions have been measured for the propene-argon mixtures of different 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: CH5+ (m/q=17), C2H2+ (m/q=26), C2H3+ (m/q=27), C2H4+ (m/q=28), C2H5+ (m/q=29), C3H3+/39Ar+ (m/q=39), C3H4+/40Ar+ (m/q=40), C3H5+ (m/q=41), C3H6+/42Ar+ (m/q=42), C3H7+ (m/q=43), C3H8+ (m/q=44), C4H5+ (m/q=53), C4H6+ (m/q=54), C4H7+ (m/q=55), C4H8+ (m/q=56), C4H9+ (m/q=57), C5H5+ (m/q=65), C5H6+ (m/q=66), C5H7+ (m/q=67), C5H8+ (m/q=68), C5H9+ (m/q=69), C5H10+ (m/q=70) were observed. 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 fixed at 5 V for all measurements. The total mixture pressure was changed from 0.7 to 26.6 Pa. Schemes of ion-molecule reactions were proposed.

DOI: 10.12693/APhysPolA.123.911 PACS numbers: 82.30.Fi, 07.75.+h, 07.81.+a, 92.60.Sz