Concurrent ion-molecule reactions. Part 5.—Reactions in mixtures of methyl chloride with deuterium and tetradeuteromethane

1968 ◽  
Vol 64 (0) ◽  
pp. 1287-1295 ◽  
Author(s):  
A. G. Harrison ◽  
J. C. J. Thynne
Keyword(s):  
Methyl Chloride ◽  
Ion Molecule Reactions

Energy dependence of ion-molecule reactions. II. Methyl chloride

1969 ◽  
Vol 22 (11) ◽  
pp. 2275 ◽  
Author(s):  
NA McAskill
Keyword(s):  
Energy Range ◽  
Gas Phase ◽  
Energy Dependence ◽  
Mass Spectrometer ◽  
Rate Constant ◽  
Methyl Chloride ◽  
Negative Ion ◽  
Polar Molecules ◽  
Ion Energy ◽  
Ion Molecule Reactions

The ion-molecule reactions of ions in methyl chloride were studied in the gas phase at source pressures of up to 120 μ in a mass spectrometer using ions having exit energies which ranged from 0.2 to 2.0 eV. The ions produced by secondary processes included CH4Cl+, CH2Cl+, and C2H6Cl+. The rate constant for the reaction of CH3Cl+ was found to be independent of the ion energy in the energy range studied. A theoretical rate constant which is independent of the ion energy was also derived for reactions between ions and polar molecules. Negative ion spectra were briefly examined.

Ion–Molecule Reactions in Methyl Fluoride and Methyl Chloride

1971 ◽  
Vol 49 (13) ◽  
pp. 2217-2222 ◽  
Author(s):  
A. A. Herod ◽  
A. G. Harrison ◽  
N. A. McAskill
Keyword(s):  
Kinetic Energy ◽  
Methyl Chloride ◽  
Molecular Ions ◽  
Rate Coefficients ◽  
Minor Importance ◽  
Methyl Fluoride ◽  
Ion Molecule Reactions ◽  
Fragment Ions ◽  
Ion Energies ◽  
Ion Kinetic Energy

The reactions of the molecular ion have been studied as a function of the ion kinetic energy for methyl fluoride and methyl chloride. The following reactions are observed[Formula: see text]For methyl fluoride (X = F) reactions c and d have kinetic energy thresholds and become significant at high ion energies. For CH3Cl (X = Cl) reaction a is not observed and reactions c and d are of only minor importance at high ion energies. Rate coefficients for the molecular ions and a number of fragment ions as well as rate coefficients for further reaction of CH4X+ are reported.

Reactivity Trends in the Gas Phase Addition of Acetylene to N-protonated Aryl Radical Cations

2020 ◽  
Author(s):  
Oisin Shiels ◽  
P. D. Kelly ◽  
Cameron C. Bright ◽  
Berwyck L. J. Poad ◽  
Stephen Blanksby ◽  
...  
Keyword(s):  
Gas Phase ◽  
Ion Trap ◽  
Radical Cations ◽  
Rate Coefficients ◽  
Similar Process ◽  
Ion Molecule Reactions ◽  
Aromatic Radicals ◽  
Polycyclic Aromatic ◽  
Gas Phase Ion ◽  
Type Radical

<div> <div> <div> <p>A key step in gas-phase polycyclic aromatic hydrocarbon (PAH) formation involves the addition of acetylene (or other alkyne) to σ-type aromatic radicals, with successive additions yielding more complex PAHs. A similar process can happen for N- containing aromatics. In cold diffuse environments, such as the interstellar medium, rates of radical addition may be enhanced when the σ-type radical is charged. This paper investigates the gas-phase ion-molecule reactions of acetylene with nine aromatic distonic σ-type radical cations derived from pyridinium (Pyr), anilinium (Anl) and benzonitrilium (Bzn) ions. Three isomers are studied in each case (radical sites at the ortho, meta and para positions). Using a room temperature ion trap, second-order rate coefficients, product branching ratios and reaction efficiencies are reported. </p> </div> </div> </div>

Isotopic Characterization (2H, 13C, 37Cl, 81Br) of the Abiotic Sinks of Methyl Bromide and Methyl Chloride in Water and Implications for Future Studies.

2018 ◽  
Author(s):  
Axel Horst ◽  
Magali Bonifacie ◽  
Gérard Bardoux ◽  
Hans-Hermann Richnow
Keyword(s):  
Methyl Bromide ◽  
Isotope Fractionation ◽  
Methyl Chloride ◽  
Methyl Halides ◽  
Future Studies ◽  
Halide Exchange ◽  
Isotopic Characterization

In this study we investigated the isotope fractionation of the abiotic sink (hydrolysis, halide exchange) of methyl halides in water.<br>

Properties and Reactivity of First and Second Row Hydrides. IV. Interactions Between Hydrides and Their Radical Ions

1993 ◽  
Vol 58 (1) ◽  
pp. 1-10 ◽  
Author(s):  
Rudolf Zahradník
Keyword(s):  
Radical Cations ◽  
Stabilization Energy ◽  
Hydrogen Atom Abstraction ◽  
Type Ii ◽  
Radical Ions ◽  
Reaction Products ◽  
Ion Molecule Reactions ◽  
Heats Of Reaction ◽  
Experimental Values ◽  
Easy Differentiation

The energies and heats of ion-molecule reactions have been calculated (MP4/6-31G**//6-31G** or better level) and compared with the experimental values obtained from the heats of formation. Two main types of reactions have been studied: (i) AHn + AHn+• ↔ AHn+1+ + AHn-1• (A = C to F and Si to Cl), (ii) AHn + BHm+• ↔ AHn+1+ + BHm-1• or AHn-1+• + BHm+1+ (A and B = C to F). In contrast to (i), processes of type (ii) permit easy differentiation between the proton transfer and hydrogen atom abstraction mechanisms. A third type of interaction involves reactions with radical anions (A = Li to F); comparison was made with analogous processes with radical cations. A brief comment is made about the influence of the level of computational sophistication on the energies and heats of reaction, as well as on the stabilization energy of a hydrogen bonded intermediate, a structure which is similar to that of the reaction products.

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