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

Research output: Contribution to journalArticlepeer-review

84 Citations (Scopus)


The UV-VIS characteristics of carbon ions fabricated by an arch discharge in water or liquid nitrogen show characteristics that are similar to the interstellar absorption feature. Thus, high purity and well separated carbon onion samples prepared by annealing the as-fabricated powder in air at 600°C for 60 showed a constant absorption peak at 4.6 μm-1 with a variable width ranging from 1.2-1.6 μm-1. In addition to the UV-VIS data, the origin of the absorption feature at 4.6 μm-1 in carbon onions can be attributed to the collective excitations of π plasmons.

Original languageEnglish
Article number155504
Pages (from-to)155504/1-155504/4
JournalPhysical review letters
Issue number15
Publication statusPublished - Apr 18 2003

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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