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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Dynamical Models of the Chemistry in Interstellar Clouds, in detail. In many dark clouds, both observations and theory indicate that material is continually recycled between dense and tenuous states and that the dynamics of this recycling drastically affects the chemical evolution. In diffuse clouds, recent studies of interstellar grains indicate that the

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Chemistry in Expanding Circumstellar Envelopes,chemical processes help determine the overall chemical composition of such envelopes, the detailed composition, as evidenced by the many molecules detected at radio wavelengths, is best explained by a complex ion-molecule chemistry driven by ionisation caused by the ambient external ultraviolet radi

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Chemistry in Shocked Interstellar Gas,ntly enhanced by the rotational excitation energy of the H. molecule in the reaction C. (H.(J),H) CH. but is increased if the reaction CH. (H., H)CH. proceeds at appreciably less than the Langevin rate at high effective temperatures.

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Radiative Pumping and Collisional Excitation of Molecules in Diffuse Interstellar Clouds,t 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 state to state chemistry is stressed out. We discuss the implications of these new data in a recent comprehensive model of diffuse interstellar clouds (Viala et al., 1987).

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Charge Transfer in Astrophysical Plasmas, to calculate the cross-sections. A comparison of recent theoretical results with the available experimental data at laboratory energies would indicate that the theoretical model should be reliable for predicting cross-sections at astrophysical energies.

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