Titlebook: Rate Coefficients in Astrochemistry; Proceedings of a Con T. J. Millar,D. A. Williams Conference proceedings 1988 Kluwer Academic Publisher

harangue

Experimental Measurements of the Rate Constants for Neutral-Neutral Reactions,n of these methods to reactions of two types — radical-molecule and radical-radical reactions — is illustrated by reference to some recent studies in the author’s laboratory. As most radical-molecule reactions have significant activation energies they will be insignificantly slow at the temperatures

有罪

Studies of Ion-Molecule Reactions at T < 80k,s. With an ion trap and a static drift tube cryogenic cooling by liquid helium is used. These techniques are therefore restricted to molecular hydrogen as neutral reactant. With the CRESU method the low temperature is obtained by supersonic expansion. This last technique has a high chemical versatil

AVID

Drift Tube Studies of Ion-Neutral Reactions and Their Relevance to Interstellar Chemistry,e ion/reactant molecule (E.) and the ion/buffer gas (E.) centre-of-mass energies are discussed. It is shown that drift tube data of k versus E., for atomic ion/neutral reactions can be used with confidence in modelling the ion chemistry of shocked interstellar gas. However, it is stressed that drift

Phagocytes

Laboratory Studies of Dissociative Recombination and Mutual Neutralization and Their Relevance to Itive-ion/negative-ion mutual neutralization coefficients, q., are briefly discussed. These include the stationary afterglow (SA), the variable-temperature flowing afterglow/Langmuir probe VT-FALP) and the merged beam (MB) techniques. It is suggested that the data of choice for interstellar ion-chemi

數(shù)量

Chemical Pathways from Atomic Silicon Ions to Silicon Carbides and Oxides,first steps in the chemical pathways leading from atomic silicon to the formation of silicon carbide and oxide molecules of the type which may be precursors for the formation of silicon carbide and silicate grain particles in carbon-rich and oxygen-rich astrophysical environments.

genesis

Anterior

Common-Migraine

Dense Interstellar Cloud Chemistry,include the delineation of the reaction pathways by which complex molecules are produced, a preliminary understanding of the varied chemistries existing in and near regions of star formation, an appreciation that photodissociation caused by internally generated photons is important, and a realizatio

Fibrinogen

,Hot Molecular Cores — A Case for Accretion, we demonstrate that accretion does occur and that reactions on the surface with hydrogen and deuterium atoms are important. Observations of hot cores show enhanced abundances of ammonia, methanol and deuterium-bearing species. These enhancements cannot be reproduced by gas-phase chemistry alone. We

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