Open Access
Table 4
Likely partition of carbon in the diffuse ISM dust phases.
| Carbon phase | Abundance |
|---|---|
| Primitive meteorites [%] | |
| Organic matter | 3–4 |
| Pre-solar grains [ppm] | |
| Nano-diamonds | 1400 ≡ 0.14% |
| SiC | 50 |
| Graphite | 10 |
| Diffuse ISM abundances | |
| [ppm and % of C in dust] | |
| a-C:H | ≳60 ppm ≡ ≳19% |
| a-C | ~150 ppm ≡ ~49% |
| Nano-diamonds | ≲20 ppm ≡ ≲7% |
| C in SiC | ≲25 ppm ≡ ≲8% |
| Graphite | ≲10 ppm ≡ ≲3% |
| Aromatic-rich a-C | ≤5 ppm ≡ <14% |
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