Table 3
Diamond optical features at room temperature due to defects and heteroatoms.
| Site | λc [nm] | E [eV] | Origin | Fluorescence | Occurence |
|---|---|---|---|---|---|
| ND1 | 393.6 | 3.150 | V− | Blue | UV irrad. |
| N3 | 415.2 | 2.985 | 3N+V | Green | Natural |
| N2 | 477.2 (+ 423, 435, 452, 465) | 2.598 | |||
| 480 | 480 (broad band) | 2.580 | Substituted O ? | Green | Natural |
| H4 | 496.2 | 2.498 | 4N+2V | Green | Natural or UV irrad. |
| 3H | 503.4 | 2.462 | Interstitial C | – | UV irrad. |
| 550 | 550 (broad band) | 2.250 | Deformation? | – | Natural |
| NV0 | 575.1 (+ other bands) | 2.156 | NV0 | Red | Natural or UV irrad. |
| 595 | 594.4 | 2.086 | N? | – | Natural or UV irrad. + annealing |
| NV− | 637.5 (+ other bands) | 1.945 | NV− | Red | Natural or UV irrad. + annealing |
| GR1 | 740.9, 744.4 (+ other bands) | 1.673, 1.665 | V0 | – | UV irrad. |
Notes. These data are taken from Shigley & Breeding (2013), where V indicates a vacancy, N an impurity nitrogen atom, with their number preceding, and the 0 or − superscript the charge state of the defect. The band centre positions, λc, boldfaced incolumn 2 indicate lines and features close to those observed in the Red Rectangle and/or amongst the diffuse interstellar bands (DIBs).
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