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Published online by Cambridge University Press: 12 April 2016
It has long been recognized that collisional cooling and recombination processes are likely to be important in the inner cometary coma, in a 104 km radius region for the larger comets (Biermann & Trefftz 1964) Cherednichenko (1970) laid stress on dissociative recombination processes, as possibly playing a role in the production of observed ions and radicals. Oppenheimer, in his spirited contribution to this conference, emphasized that a variety of ion-molecule interactions occur relatively rapidly and probably take part in the production of known cometary radicals.