| Abstract |
QCC formed from a hydrogen plasma exhibits 220nm absorption close to 217.5nm interstellar absorption feature. We reported in GFWS28 that Raman spectra of the QCC show polyacetylene-like peaks in addition to G and D peaks due to sp2 carbon atoms and supposed that the origin of the absorption band is attributed to pai transition due to their conjugated double bonds. In this study, we performed synthesis of N-bearing carbonaceous materials with the aim of supporting the previous conclusion. The materials have been produced by exposing coronene powders to nitrogen plasma generated by a microwave discharge at 2.45GHz. Although UV absorbance peaks and Raman spectra differed from every materials, only material with 220nm absorption showed Raman spectra similar to that of QCC. This result indicates that the origin of 220nm absorption is related to the conjugated double bonds. In this talk, I will dicuss the carrier of interstellar 217.5nm absorption based on above experimental results. |
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