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

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Drift Tube Studies of Ion-Neutral Reactions and Their Relevance to Interstellar Chemistry, gas. Some consideration is given to the variation with E. and E. of the rate coefficients, k., for ternary association reactions and to the relevance of the data in estimating radiative association rate coefficients appropriate to shocked interstellar gas.

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Radiative Association,ernary) association studies yield valuable information about radiative association processes. In this review, we consider the nature of association reactions — both radiative and ternary — and discuss experimental and theoretical approaches to the determination of rate coefficients of radiative association reactions.

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,Hot Molecular Cores — A Case for Accretion,f a nearby star. Support is thereby given to the idea that mantle material is returned to the gas-phase sporadically, on a timescale of a million years, as a result of star formation, shocks etc., rather than by a continually acting desorption mechanism.

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Conference proceedings 1988 and C2 would appear to be proIDising" P Swings and L Rosenfeld Astrophysical Journal 86,483(1937) This may have been the first attempt at modelling interstellar chemistry. As with models today, the methods used lacked reliability, but the speculation was impressive! Mark Twain might well have said

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Dissociative Recombination: Polyatomic Positive Ion Reactions with Electrons and Negative Ions, point of view. It is argued that polyatomic ions are composed of valence bonds and that the dissociative recombination process normally involves the rupture of one of these bonds. This viewpoint leads to markedly different products from the predictions of previous theories. Recombination between a

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Photodissociation and Photoionization Processes,endent photodestruction rates by the interstellar radiation field are presented for a number of atoms and small molecules. The photodissociation processes of CO are discussed with reference to new laboratory data on the absorption cross sections.

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Radiative Pumping and Collisional Excitation of Molecules in Diffuse Interstellar Clouds,reviewed. Particular attention is drawn to non-adiabatic coupling effects on the intensities of Lyman and Werner band systems of the vacuum ultraviolet spectrum of H. and to the role of nuclear spin on ortho-para transitions in H. due to H. collisions. The inter-relation between those processes and

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Charge Transfer in Astrophysical Plasmas,ures of the collision process are analyzed within the framework of the molecular model and a brief discussion is given of the theoretical methods used to calculate the cross-sections. A comparison of recent theoretical results with the available experimental data at laboratory energies would indicat