Mathematics – Probability
Scientific paper
Apr 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990nascp3061..275k&link_type=abstract
In NASA, Ames Research Center, Carbon in the Galaxy: Studies from Earth and Space p 275-284 (SEE N90-27562 21-88)
Mathematics
Probability
2
Astronomical Spectroscopy, Carbon, Cool Stars, Cosmic Dust, Interstellar Matter, Molecular Chains, Stellar Envelopes, Stellar Mass Ejection, Vapor Phases, Infrared Radiation, Probability Theory, Spectroscopy, Ultraviolet Absorption
Scientific paper
The intriguing abundance of long linear carbon chain molecules in some dark clouds and in circumstellar shells is still not well understood. Recent laboratory studies which have probed this problem indicate that when carbon vapor nucleates to form particles, linear chains and hollow cage molecules (fullerenes) also form at more-or-less the same time. The results have consequences for the formation, structures and spectroscopic properties of the molecular and dust components ejected from cool carbon-rich stars. A most interesting result of the experimental observations relates to the probability that a third character in addition to the chains and grains, the C60 molecule probably in the form of the ion C60+ in the less shielded regions, is present and perhaps responsible for some of the ubiquitously observed interstellar spectroscopic features such as the Diffuse Interstellar Features, the 2170A UV Absorption or perhaps some of the Unidentified Infrared Bands. Further study of small carbon particles which form in the gas phase has resulted in the discovery that they have quasi-icosahedral spiral shell structures. The role that such species may play in the interstellar medium as well as that played by C60 (or C60+) should soon be accessible to verification by a combination of laboratory experiment and astronomical spectroscopy.
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