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Fullerenes, graphenes, PAHs Polycyclic aromatics and the Diffuse Interstellar Bands

Le 24 janvier 2020
De 10h30 à 12h00

Bernard Foing



C60 was discovered in 1985 from a mass spectrometer peak  by Kroto, Curl, Smalley & al,, for which they got the Nobel Prize in Chemistry in 1996. It was then produced in macroscopic quantities by  Kratschmer et al in 1990, that allowed to confirm the structure of soccer ball geometry, and started a revolution in research and application, to the delight of chemists, physicists, astronomers, architects and UEFA-FIFA fans.

In 1994 Foing & Ehrenfreund reported the discovery of two near IR diffuse bands coincident with C60+ bands, with abundance of about 0.5 % of cosmic carbon .The interstellar bands detected at OHP observatory  at 9577 & 9632 A were consistent with C60+ spectra in frozen matrix lab measured in 1992 by D’Hendecourt, Fostiropoulos & Léger  & other groups.  The DIBs assignment as C60+, largest  (and most beautiful)  interstellar molecule was celebrated by H. Kroto, and confirmed in subsequent observations (ESO, CFHT, etc..)  and recently by latest near gas phase laboratory experiments.

The quest for fullerenes, PAHs and large organics in space and Diffuse Interstellar Bands (DIBs) research has advanced since 20 years. DIB observational surveys,  DIB families, correlations and environment dependences, resolved substructures indicative of rotational contours by large molecules. DIBs carriers have been linked with large organic molecules observed in the interstellar medium such as IR bands (assigned to PAHs, with some new bands detected by Spitzer assigned to fullerenes, Cami et al 2010 ), Extended Red Emission or recently detected Anomalous Microwave Emission (AME). Fullerenes and PAHs have been proposed to explain some DIBs and specific molecules were searched. These could be present in various dehydrogenation and ionisation conditions, for example fully dehydrogenated (Vuong, Foing 2000), in a form similar to graphenes (Nobel prize Physics 2010).

Experiments in the laboratory and in space (on FOTON BIOPAN, ISS EXPOSE, OREO Cubes) allow to measure the survival and by-products of these molecules.

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