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Influence of Repeller Potential on Ion-Molecule Reactions in H_2S and CH_4 Mixtures

100%
Wójcik L., Markowski A.
Acta Physica Polonica A
|
2011
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vol. 120
|
issue 1
13-15
EN
Ion-molecule reactions initiated by electron impact in the hydrogen sulfide-methane mixtures have been studied by means of quadrupole mass spectrometer with a high-pressure ion source. The total gas pressure of investigated mixtures was changed from 0.7 to 33.3 Pa. Influence of repeller potential on ion-molecule reactions have been studied. The repeller potential was changed in the range 2-12 V. Measurements were performed for different concentrations of methane and hydrogen sulfide in the mixture (from 10% H_2S + 90% CH_4 to 90% H_2S + 10% CH_4 with 10% increment). The major ion-molecule reactions have been identified. The primary ions C^{+}, CH^{+}, CH_2^{+}, CH_3^{+}, CH_4^{+}, S^{+}, HS^{+}, H_2S^{+} produced in gas by the electrons with the energy of 300 eV and secondary CH_5^{+}, C_2H_5^{+}, H_3S^{+}, H_2^{34}S^{+}, H_3^{34}S^{+}, CHS^{+}, CH_3S^{+}, S_2^{+}, HS_2^{+}, H_2S_2^{+} and H_3S_2^{+} from the ion-molecule reactions were observed. Relative intensities for primary and secondary ions are presented as a function of potential of repeller electrode and concentration of methane in the mixture.
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Mass Spectrometric Study of Positive Ion-Molecule Reactions in the C_{3}H_{6} and Ar Mixtures Inside the High Pressure Ion Source

81%
Markowski A., Szot E., Wójcik L.
Acta Physica Polonica A
|
2013
|
vol. 123
|
issue 5
911-915
EN
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: CH_{5}^{+} (m/q=17), C_{2}H_{2}^{+} (m/q=26), C_{2}H_{3}^{+} (m/q=27), C_{2}H_{4}^{+} (m/q=28), C_{2}H_{5}^{+} (m/q=29), C_{3}H_{3}^{+}/^{39}Ar^{+} (m/q=39), C_{3}H_{4}^{+}/^{40}Ar^{+} (m/q=40), C_{3}H_{5}^{+} (m/q=41), C_{3}H_{6}^{+}/^{42}Ar^{+} (m/q=42), C_{3}H_{7}^{+} (m/q=43), C_{3}H_{8}^{+} (m/q=44), C_{4}H_{5}^{+} (m/q=53), C_{4}H_{6}^{+} (m/q=54), C_{4}H_{7}^{+} (m/q=55), C_{4}H_{8}^{+} (m/q=56), C_{4}H_{9}^{+} (m/q=57), C_{5}H_{5}^{+} (m/q=65), C_{5}H_{6}^{+} (m/q=66), C_{5}H_{7}^{+} (m/q=67), C_{5}H_{8}^{+} (m/q=68), C_{5}H_{9}^{+} (m/q=69), C_{5}H_{10}^{+} (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 V_{R} 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.
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