Ion−Molecule Reactions and Fragmentation Patterns in Helium Nanodroplets†

2007 ◽  
Vol 111 (31) ◽  
pp. 7481-7488 ◽  
Author(s):  
Adrian Boatwright ◽  
Jay Jeffs ◽  
Anthony J. Stace
Keyword(s):  
Helium Nanodroplets ◽  
Ion Molecule Reactions ◽  
Fragmentation Patterns

Ion-Molecule Reactions in Helium Nanodroplets Doped with C60and Water Clusters

2009 ◽  
Vol 48 (47) ◽  
pp. 8940-8943 ◽  
Author(s):  
Stephan Denifl ◽  
Fabio Zappa ◽  
Ingo Mähr ◽  
Filipe Ferreira da Silva ◽  
Abid Aleem ◽  
...  
Keyword(s):  
Water Clusters ◽  
Helium Nanodroplets ◽  
Ion Molecule Reactions

scholarly journals Observation of stable HO4+ and DO4+ ions from ion–molecule reactions in helium nanodroplets

2016 ◽  
Vol 18 (19) ◽  
pp. 13169-13172 ◽  
Author(s):  
Michael Renzler ◽  
Stefan Ralser ◽  
Lorenz Kranabetter ◽  
Erik Barwa ◽  
Paul Scheier ◽  
...  
Keyword(s):  
Experimental Observation ◽  
Helium Nanodroplets ◽  
Ion Molecule Reactions ◽  
Enhanced Stability ◽  
Made In

Experimental observation of the enhanced stability of the HO4+ ion has been made in a study using helium nanodroplets.

Ion-Molecule Reactions in Helium Nanodroplets Doped with C60and Water Clusters

2009 ◽  
Vol 121 (47) ◽  
pp. 9102-9105 ◽  
Author(s):  
Stephan Denifl ◽  
Fabio Zappa ◽  
Ingo Mähr ◽  
Filipe Ferreira da Silva ◽  
Abid Aleem ◽  
...  
Keyword(s):  
Water Clusters ◽  
Helium Nanodroplets ◽  
Ion Molecule Reactions

Gas-Phase Reactivity of Copper Cations with Ketones

2001 ◽  
Vol 7 (4-5) ◽  
pp. 313-320 ◽  
Author(s):  
P. Fordham ◽  
M. Deschasse ◽  
V. Haldys ◽  
J. Tortajada ◽  
J.-P. Morizur
Keyword(s):  
Gas Phase ◽  
Copper Ions ◽  
Ion Molecule Reactions ◽  
Fragmentation Mechanisms ◽  
Dehydration Reactions ◽  
Ion Kinetic Energy ◽  
The Rich ◽  
Fragmentation Patterns ◽  
Gas Phase Ion ◽  
Chemical Ionisation

Gas-phase ion–molecule reactions between copper ions and ketones were investigated. Organometallic adducts were prepared using a chemical ionisation/fast-atom bombardment source. Abundant pseudo-molecular ion adducts were observed in the Cu+-chemical ionisation mass spectra and their unimolecular decompositions were studied by tandem mass spectrometry. Mass-analysed ion kinetic energy spectroscopy revealed diagnostic fragmentation patterns. Losses of alkenes, losses of alkanes and dehydrogenation and dehydration reactions were observed, as well as eliminations of CuR (R = C nH2 n + 1). The rich reaction chemistry of the cationised ketones enabled differentiation of the majority of the linear and branched ketone isomers studied. Isotope-labelled derivatives were employed to elucidate fragmentation mechanisms.

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>

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.

scholarly journals The chemistry of cool circumstellar envelopes

1987 ◽  
Vol 122 ◽  
pp. 551-552
Author(s):  
L.A.M. Nejad ◽  
T. J. Millar
Keyword(s):  
Kinetic Model ◽  
Chemical Kinetic ◽  
Time Dependent ◽  
Circumstellar Envelopes ◽  
Chemical Kinetic Model ◽  
Ion Molecule Reactions ◽  
Cool Stars

We have developed a time-dependent chemical kinetic model to describe the chemistry in the circumstellar envelopes of cool stars, with particular reference to IRC + 10216. Our detailed calculations show that ion-molecule reactions are important in the formation of many of the species observed in IRC + 10216.

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