High pressure mass spectrometric study of ion/molecule reactions in the carbon dioxide–methane mixtures

Wójcik, Leszek; Markowski, Artur

doi:10.1016/s0042-207x(02)00675-9

Cited by 9 publications

(2 citation statements)

References 18 publications

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“…The instrument and techniques were described previously [21][22][23]. Hydrogen sulfide and methane used in experiment, supplied by Praxair and Merck were of the best available purity (99.8% and 99.99%, respectively).…”

Section: Methodsmentioning

confidence: 99%

Influence of Repeller Potential on Ion-Molecule Reactions in H₂S and CH₄Mixtures

Wójcik

Markowski

2011

Acta Phys. Pol. A

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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% H2S + 90% CH4 to 90% H2S + 10% CH4 with 10% increment). The major ion-molecule reactions have been identified. The primary ions C + , CH + , CH + 2 , CH + 3 , CH + 4 , S + , HS + , H2S + produced in gas by the electrons with the energy of 300 eV and secondary CH + 5 , C2H + 5 , H3S + , H 34 2 S + , H 34 3 S + , CHS + , CH3S + , S + 2 , HS + 2 , H2S + 2 and H3S + 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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Section: Methodsmentioning

confidence: 99%

Influence of Repeller Potential on Ion-Molecule Reactions in H₂S and CH₄Mixtures

Wójcik

Markowski

2011

Acta Phys. Pol. A

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“…Traps capable of functioning at Torr pressures have potential utility in a range of analytical platforms, and particularly those involving MS and ion mobility spectrometry (IMS). Higher pressures often accelerate ion–molecule reactions, − improve ion fragmentation efficiencies in some situations, and increase ion–molecule collision frequency for damping ion motion more rapidly resulting in improved mass resolution and fragment ion transmission . Furthermore, platforms that function at high pressures remain attractive by having, e.g., lower cost, reduced size, and power requirements of pumping systems, e.g., benefiting the development of miniature and portable MS. , Despite these potential benefits, the trapping and storage of ions becomes progressively less effective with increasing pressure …”

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confidence: 99%

Ion Trapping, Storage, and Ejection in Structures for Lossless Ion Manipulations

et al. 2015

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A new Structures for Lossless lon Manipulations (SUM) module, having electrode arrays patterned on a pair of parallel printed circuit boards (PCB), was constructed and utilized to investigate capabilities for ion trapping at a pressure of 4 Torr. Positive ions were confined by application of RF voltages to a series of inner rung electrodes with alternating phase on adjacent electrodes, in conjunction with positive DC potentials on surrounding guard electrodes on each PCB. An axial DC :field was also introduced by stepwise varying the DC potentials applied to the inner rung electrodes to control the ion transport and accumulation inside the ion trapping region. We show that ions can be trapped and accumulated with up to 100% efficiency, stored for at least 5 h with no significant losses, and then could be rapidly ejected from the SUM trap. The present results provide a foundation for the development of much more complex SUM devices that facilitate extended ion manipulations.

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Ion–molecule reaction in pure H2S

Wójcik

Markowski

2005

Vacuum

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High pressure mass spectrometric study of ion/molecule reactions in the carbon dioxide–methane mixtures

Cited by 9 publications

References 18 publications

Influence of Repeller Potential on Ion-Molecule Reactions in H₂S and CH₄Mixtures

Influence of Repeller Potential on Ion-Molecule Reactions in H₂S and CH₄Mixtures

Ion Trapping, Storage, and Ejection in Structures for Lossless Ion Manipulations

Ion–molecule reaction in pure H2S

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High pressure mass spectrometric study of ion/molecule reactions in the carbon dioxide–methane mixtures

Cited by 9 publications

References 18 publications

Influence of Repeller Potential on Ion-Molecule Reactions in H2S and CH4Mixtures

Influence of Repeller Potential on Ion-Molecule Reactions in H2S and CH4Mixtures

Ion Trapping, Storage, and Ejection in Structures for Lossless Ion Manipulations

Ion–molecule reaction in pure H2S

Contact Info

Product

Resources

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Influence of Repeller Potential on Ion-Molecule Reactions in H₂S and CH₄Mixtures

Influence of Repeller Potential on Ion-Molecule Reactions in H₂S and CH₄Mixtures