By N.G. Adams, L.M. Babcock

Gas-phase ion chemistry is a large box which has many functions and which encompasses quite a few branches of chemistry and physics. An software that attracts jointly a lot of those branches is the synthesis of molecules in interstellar clouds. This was once a part of the incentive for reviews at the neutralization of ions via electrons and on isomerization in ion-neutral institutions. the result of investigations of specific facets of ion dynamics are offered during this quantity. Solvation in ion-molecule reactions is mentioned and prolonged to incorporate multiply charged ions via the appliance of electrospray recommendations. This quantity additionally presents a wealth of knowledge on response thermodynamics that's severe in identifying response spontaneity and availability of response channels. extra concentrated stories also are offered in the direction of the tip of this quantity, on the subject of the ionization method and its nature.

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Kraemer (Garching), is the dissociative recombination of HCO+: HCO + + e- ---) CO(v) + H (37) In this system there is only one exothermic set of products and the problem consists of determining the vibrational distribution of the CO product in both its ground and first excited electronic states. , 8~as well as the approximate treatment of Bates. 79 Assuming some success in this endeavor, we propose to study reaction 33 to determine the HNC/HCN product ratio with potential surfaces from a French quantum chemistry group.

Nor do our results for f - ~ strongly contradict the tentative identification of this molecule as the carrier of two DIBs by Foing and Ehrenfreund, 9 but do show that i f f - ~ is abundant, so is the heretofore undetectedf-C6o. Interestingly, our purely gas-phase models predict small abundances in dispersing clouds for linear clusters and hydrocarbons, due mainly to their relatively rapid photodissociation rates (the molecules are too small to be stable against photodissociation). This result is different from that of Thaddeus, who used smaller photodestruction rates, and a larger (assumed) abundance of seed molecules.

10 24 48 64 No. of Carbon Atoms Figure 2. The new species added to our chemical models of interstellar clouds. The species range in complexity from 10-64 carbon atoms and Comprise the following groups of molecules: linear carbon chains, monocyclic rings, tricyclic rings, and fullerenes. The synthetic pathways are also indicated. See ref. 83. Reproduced from the International Journal of Mass Spectrometry and Ion Processes, vol. RA. Bettens, Eric Herbst "The interstellar gas phase production of highly complex hydrocarbons: construction of a model", pp 321-343 (1995) with kind permission from Elsevier Science-NL, Sara Burgerhartstraat25, 1055 KV, Amsterdam, The Netherlands.

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