The importance of kinetically excited ions in the synthesis of interstellar molecules

Details The importance of kinetically excited ions in the synthesis of interstellar molecules The importance of kinetically excited ions in the synthesis of interstellar molecules

Dec 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984mnras.211..857a&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 211, Dec. 15, 1984, p. 857-865.

Other

54

Interstellar Matter, Ionic Reactions, Molecular Clouds, Molecular Ions, Reaction Kinetics, Hydrogen Sulfide, Ion Temperature, Magnetohydrodynamic Waves, Molecular Excitation, Shock Wave Propagation

Scientific paper

The authors have presented laboratory data which show that elevated ion-molecule centre-of-mass kinetic energies, KEcm, can overcome activation-energy barriers and small endoergicities in ion-molecule reactions. Thus, KEcm can promote some ion-molecule reactions involving H2 which may be important in interstellar clouds. Kinetically-excited ions result from interstellar MHD shocks and therefore many of the reactions discussed in this paper, which are otherwise slow or energetically inhibited, can proceed rapidly under such conditions. The authors have re-investigated NH3 and H2S synthesis in interstellar clouds but have only been able to reconcile their model predictions with observations when reactions involving N and S atoms are included in the schemes. Use of their experimental data for the rate coefficient at elevated KEcm for the C+-H2 reaction in a model of CH+ production in shocked interstellar gas leads to good agreement between the model predictions and the observations.

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