Abstract
Current results of a comprehensive theoretical and experimental study of the formation of cosmic grains are described. Grain formation as distinguished from growth takes place in cooling, high temperature clouds at densities between 10 8 and 10 11 cm −3, comprised of all elements in cosmic proportions. This system differs considerably from terrestial conditions and equilibrium nucleation theories cannot be used. A kinetic theory of formation is presented which depends upon the high degree of vibrational disequilibrium. Detailed, quantitative results require molecular parameters and cross-sections which current experimental and theoretical techniques are expected to provide. Experiments on magnesium silicate formation in the vapor and in a low temperature nitrogen matrix are described. The smoke, matrix residue, and cosmic grains show very similar infrared spectra.
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