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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.
2
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Fragmentation and Kinetic Energy Release of Ions Produced from C_2H_5OH

81%
Szot E., Głuch K., Wójcik L.
Acta Physica Polonica A
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2013
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vol. 123
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issue 5
797-799
EN
The high resolution double focusing mass spectrometer of reversed Nier-Johnson geometry was used in research of ionization and fragmentation processes of ethanol molecules C_2H_5OH. Using the mass-analyzed ion kinetic energy technique, fragmentation paths and kinetic energy release distributions were examined for the four fragmentation reactions: C_2H_6O^{+} → C_2H_5O^{+}, C_2H_6O^{+} → C_2H_3O^{+}, CH_3O^{+} → CH_2O^{+} and CH_3O^{+} → CHO^{+}. For all fragment ions from these reactions mean values of kinetic energy release 〈ε〉 were determined. We calculated mean values of 〈ε〉 as 22.70 meV, 62.15 meV, 30.25 meV, and 117.20 meV for C_2H_5O^{+}, C_2H_3O^{+}, CH_2O^{+}, and for CHO^{+} ions, respectively.
3
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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
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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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