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Carbon Onions: Carriers of the 217.5 nm Interstellar Absorption Feature
Physical Review Letters
Ultraviolet-visible absorption measurements of high purity and well separated carbon onion samples are reported. The results show that, after purification, absorption features from carbon onions match well with the interstellar UV spectrum. The measurements show that the absorption peak position remains constant at 4:55 0:1 m ÿ1 , and the width varies from 1:2-1:6 m ÿ1 , a key feature of the interstellar spectrum. The similarities between the experimental and observed absorption spectradoi:10.1103/physrevlett.90.155504 pmid:12732047 fatcat:f7nx6c4f2vehtingz4hlwfzd7q