Réactions ion–molécule de C2H3Cl+ avec le propane et le n-butane

1989 ◽  
Vol 67 (12) ◽  
pp. 2196-2200 ◽  
Author(s):  
Jan A. Herman ◽  
Rodica Neagu-Plesu ◽  
Urszula Krzemien ◽  
Krzysztof Bederski
Keyword(s):  
Mass Spectrometry ◽  
Charge Transfer ◽  
Vinyl Chloride ◽  
Mass Spectrometer ◽  
Pressure Range ◽  
Transfer Processes ◽  
Condensation Reactions ◽  
Ion Molecule Reactions

Ion–molecule reactions of C2H3Cl+ with propane or n-butane have been studied using a photoionization mass spectrometer over the pressure range 0.01–1 Torr. The principal reasons for disappearance of the C2H3Cl+ ion in propane and n-butane are the H−, H2− transfer processes and charge transfer in the case of n-C4H10. The ions CnH2n+1+ and CnH2n+ formed in these transfers react preferentially with neutral vinyl chloride in condensation reactions with elimination of HCl or Cl•. Keywords: ion–molecule reactions, mass spectrometry, vinyl chloride, propane, n-butane. [Journal translation]

Réactions ion/molécule de l'ion C2H3Cl+ dans le mélange gazeux: chlorure de vinyle – chlorure d'éthyle

1989 ◽  
Vol 67 (1) ◽  
pp. 97-103 ◽  
Author(s):  
Jan A. Herman ◽  
Rodica Neagu-Plesu ◽  
Leszek Wójcik
Keyword(s):  
Mass Spectrometry ◽  
High Pressure ◽  
Vinyl Chloride ◽  
Ethyl Chloride ◽  
The Other ◽  
Mass Spectrometers ◽  
Condensation Reactions ◽  
Ion Molecule Reactions ◽  
Photo Ionization

Ion/molecule reactions of C2H3Cl+ have been studied in a mixture of vinyl and ethyl chlorides. The ionic processes have been followed using two mass spectrometers; one is based on the ionic cyclotronic resonance (ICR) while the other is based on photo-ionization at high pressure. The results obtained on these two instruments are complementary and they indicate that the ion C2H3Cl+ does not react directly with ethyl chloride. However, the ions C4H3Cl+ and C4H6Cl+, which are formed following the decomposition of the excited ion-dimer of vinyl chloride, do react with ethyl chloride in a series of condensation reactions involving in each step an elimination of HCl or of Cl. In a mixture of the two chlorides, the most important ions are the C8H13+ and C8H14+; at a pressure of 1 Tonr, their total intensity is equal to 50%. Keywords: ion/molecule reactions of C2H3Cl+, vinyl and ethyl chloride mixtures, mass spectrometry. [Journal translation]

Ion/molecule reactions in allene. III. Reactions of the parent ion with neutral alkanes

1986 ◽  
Vol 64 (1) ◽  
pp. 192-197
Author(s):  
Kenzo Nagase ◽  
Jan A. Herman
Keyword(s):  
Mass Spectrometry ◽  
Rate Constants ◽  
Relative Rate ◽  
Transfer Reactions ◽  
Stabilization Process ◽  
Transfer Processes ◽  
Ion Molecule Reactions ◽  
Relative Rate Constants ◽  
Ion Species

Ion/molecule reactions between the ion C3H4+• ion, from allene and neutral alkanes were investigated by mass spectrometry. There are four H•/CH3•/H−/H2− transfer reactions and relative rate constants were calculated. The overall rates increased in the order CH4 < C2H6 < C3H8 < i-C4H10 < n-C4H10. There is also a stabilization process by alkanes of CeH8+• ion species, but its importance is lower than the above transfer processes.

ION–MOLECULE REACTIONS STUDIED BY TIME-OF-FLIGHT MASS SPECTROMETRY: II. REACTIONS IN CO–D2 AND CH4–D2 MIXTURES

1964 ◽  
Vol 42 (11) ◽  
pp. 2385-2392 ◽  
Author(s):  
Clifford W. Hand ◽  
Hanns von Weyssenhoff
Keyword(s):  
Mass Spectrometry ◽  
High Pressure ◽  
Reaction Kinetics ◽  
Electric Fields ◽  
Mass Spectrometer ◽  
Time Of Flight ◽  
Molecule Reaction ◽  
External Electric Fields ◽  
Flight Mass Spectrometry ◽  
Ion Molecule Reactions

The pulsed operation capability of the time-of-flight mass spectrometer has been used for the study of ion–molecule reaction kinetics. Reactions take place in a high-pressure (up to 0.08 Torr) region free from external electric fields, and time is used as a direct kinetic variable. The following reactions were studied.[Formula: see text]In CH4–D2 mixtures a reaction in addition to CH4+ + CH4 → CH5+ + CH3 leads to the formation of an ion of m/e 17. Various possibilities for this reaction are discussed.

Ion–molecule reactions in dimethylsulfoxide by high pressure photoionization mass spectrometry

1980 ◽  
Vol 58 (4) ◽  
pp. 376-380 ◽  
Author(s):  
John A. Stone ◽  
Margaret S. Lin
Keyword(s):  
Mass Spectrometry ◽  
High Pressure ◽  
Photon Energy ◽  
Rate Constant ◽  
Pressure Range ◽  
Low Pressure ◽  
Photoionization Mass Spectrometry ◽  
Ion Molecule Reactions

Dimethylsulfoxide (DMSO) has been photoionized at 10.0 and 11.7 eV over the pressure range 0.3–210 mTorr. The rate constant for the disappearance of DMSO+ is 1.0 × 10−9 cm3 molecule−1 s−1, independent of photon energy. The major products at low pressure are CH3SO(CH3SO)CH3+ and CH3SOHCH3+ while at high pressure the ion series (DMSO)nH+ predominates with n ≤ 5. In experiments with mixtures of DMSO and water or methanol very little mixed solvation of the proton was observed although isotopic D/H exchange between D2O and (DMSO)2H+ is facile.

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