The Formation of Interstellar Molecules by Ion-Molecule Reactions

1975 ◽  
pp. 341-352 ◽  
Author(s):  
A. Dalgarno
Keyword(s):  
Interstellar Molecules ◽  
Ion Molecule Reactions

scholarly journals The Formation of Interstellar Molecules via Radiative Association Reactions

1980 ◽  
Vol 87 ◽  
pp. 323-324
Author(s):  
David Smith ◽  
Nigel G. Adams
Keyword(s):  
Rate Coefficients ◽  
Rate Data ◽  
Association Rate ◽  
Interstellar Molecules ◽  
Ion Molecule Reactions ◽  
Radiative Association ◽  
Temperature Dependences ◽  
Association Reaction

The radiative association rate coefficients and their temperature dependences have been estimated for several likely interstellar ion-molecule reactions from laboratory collisional association rate data. They include the CH3+ + H2 and CH3+ + H2O reactions, which we suggest lead to CH4 and CH3OH respectively, and the critical association reaction C+ + H2.

scholarly journals New Interstellar Molecular Detections: Implications for “Shock Chemistry”

1987 ◽  
Vol 120 ◽  
pp. 289-292
Author(s):  
L. M. Ziurys ◽  
B. E. Turner
Keyword(s):  
High Temperature ◽  
Molecular Gas ◽  
Relative Importance ◽  
Interstellar Molecules ◽  
Vibrationally Excited ◽  
Molecular Ion ◽  
Ion Molecule Reactions ◽  
High Temperature Chemistry

Several new interstellar species have recently been detected in the molecular gas, including rotationally-excited CH, vibrationally-excited HCN, and a new molecular ion, HCNH+. These detections have raised some interesting questions concerning the relative importance of “shock” or “high temperature” chemistry vs. ion-molecule reactions in the synthesis of interstellar molecules in dense clouds.

scholarly journals Interstellar Molecules in Meteorites

1989 ◽  
Vol 135 ◽  
pp. 383-388
Author(s):  
J. F. Kerridge
Keyword(s):  
Solar System ◽  
Interstellar Medium ◽  
Low Temperatures ◽  
Isotopic Fractionation ◽  
Early Solar System ◽  
Interstellar Molecules ◽  
Interstellar Clouds ◽  
Ion Molecule Reactions ◽  
Chondritic Meteorites ◽  
Interstellar Material

Substantial enrichment of deuterium, D, in certain components of chondritic meteorites is interpreted as a record of isotopic fractionation during ion-molecule reactions at the very low temperatures characteristic of dense interstellar clouds. Whether those meteorites still contain the actual molecules that were synthesised in the presolar interstellar medium, or whether the interstellar material was recycled into a later generation of molecules within the early solar system is not known.

Candidate interstellar molecules formed from ion-molecule reactions of NO

1978 ◽  
Vol 219 ◽  
pp. 458 ◽  
Author(s):  
G. H. Loew ◽  
D. S. Berkowitz ◽  
S. Chang
Keyword(s):  
Interstellar Molecules ◽  
Ion Molecule Reactions

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>

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