Polyynes and Cyanopolyynes: Their Synthesis with the Carbon Arc Gives the Same Abundances Occurring in Carbon-Rich Stars

Details Polyynes and Cyanopolyynes: Their Synthesis with the Carbon Arc Gives the Same Abundances Occurring in Carbon-Rich Stars Polyynes and Cyanopolyynes: Their Synthesis with the Carbon Arc Gives the Same Abundances Occurring in Carbon-Rich Stars

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006oleb...36..467c&link_type=abstract

Origins of Life and Evolution of Biospheres, Volume 36, Issue 5-6, pp. 467-475

Physics

2

Polyynes, Cyanopolyynes, Dicyanopolyynes, Carbon, Vapor, Arc, Carbon-Rich Stars, Agb Stars, Relative Abundance

Scientific paper

Carbon vapour generated from a carbon arc or by laser ablation of graphite is reactive with simple molecules and atoms producing end-capped polyyne chains. With these techniques both hydrogen-terminated polyynes as well as monocyano- and dicyanopolyynes have been produced. Experiments based on arcing graphite electrodes can reproduce the molecular distribution of polyynes existing around carbon-rich AGB stars. In fact, it has been found that the relative abundances of the polyynes produced in carbon arc in vacuum decreases by a factor between 3 and 5 as the chain length increases by a C2 unit. An analogous trend has been observed both for polyynes and cyanopolyynes in the circumstellar environment around carbon-rich stars. This fact suggests that the mechanism of formation of the polyynes in the carbon arc may be similar to that occurring in the surroundings of the carbon-rich stars. Polyynes and cyanopolyynes represent authentic prebiotic molecules which appear quite ubiquitous in the cosmos and should have played a role in the early organic chemistry preceding the appearance of life.

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