Ion-molecule reactions in mixtures of methane with carbon tetrafluoride |
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Authors: | Leszek Wójcik Artur Markowski |
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Affiliation: | Institute of Physics, Maria Curie-Sklodowska University, 20-031 Lublin, Poland |
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Abstract: | Ion-molecule reactions have been measured for methane-carbon tetrafluoride mixtures of different composition using a quadrupole mass spectrometer with a high-pressure ion source. Concentration of methane in these mixtures ranged from 10% to 90% (at 10% increment). Primary ions , , F+, CF+ and were produced by electrons with energy of 300 eV. Secondary ions , , , , and were observed as the result of ion-molecule reactions. Relative current intensities for primary and secondary ions are presented as a function of both total mixture pressure and concentration of methane in the mixture. Potential of repeller electrode inside the ion source collision chamber was fixed at 5 V for all measurements. Total mixture pressure was changed from 0.7 to 33.3 Pa. Schemes of ion-molecule reactions were proposed. |
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Keywords: | Mass spectrometry Ion-molecule reactions Carbon tetrafluoride Methane |
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