Carbon Onions: Carriers of the 217.5 nm Interstellar Absorption Feature

Manish Chhowalla, H. Wang, N. Sano, K. B. K. Teo, S. B. Lee, G. A. J. Amaratunga
2003 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 spectra
more » ... that carbon onions are very strong candidates for the origin of the UV interstellar absorption peak at 4:6 m ÿ1 .
doi:10.1103/physrevlett.90.155504 pmid:12732047 fatcat:f7nx6c4f2vehtingz4hlwfzd7q