Fig. 20

Schematic diagram of the primary contributions of a-C(:H) particles to the FUV extinction (upper solid and long-dashed boxes), the UV extinction bump (vertical-lined box and dark shaded area) and the AIBs (horizontal-lined box) as function of the equivalent bulk material band gap Eg(bulk) and the particle radius. The horizontal XH ≃ 0.05 thick grey line indicates the possible minimum band gap attainable for a-C(:H) materials.
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