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Table 4

Characteristic absorption lines from the ground and the metastable levels in C-like ions.

Index 1 2 3 4
n j Lower Upper (†) Lower Upper (†) Lower Upper (†) Lower Upper
2−2 2s22p2 (3P0) 2s2p3 (3S1) 2s22p2 (3P1) 2s2p3 (3S1) 2s22p2 (3P2) 2s2p3 (3S1) 2s22p2 (1D2) 2s2p3 (1D2)
Ion λ (Å) f λ (Å) f λ (Å) f λ (Å) f
C i 1560.310 0.18 (3D1) 1560.683 0.14 (3D2) 1561.439 0.15 (3D3) 1021.853 0.61
N ii 644.634 0.25 644.837 0.25 645.179 0.25 775.966 0.36
O iii 507.389 0.20 507.680 0.20 508.178 0.20 599.590 0.34
Ne v 357.947 0.15 358.475 0.15 359.374 0.15 416.212 0.27
Mg vii 276.154 0.12 277.001 0.12 278.402 0.12 319.027 0.22
Si ix 223.743 0.10 225.024 0.10 227.000 0.10 258.080 0.19
S xi 186.839 0.08 188.675 0.08 191.266 0.09 215.968 0.16
Ar xiii 236.268 0.08 (3D1) 161.610 0.07 164.802 0.08 184.899 0.14
Ca xv 200.976 0.08 (3D1) 140.583 0.06 144.309 0.07 161.018 0.12
Fe xxi 128.752 0.09 (3D1) 142.149 0.05 (3D2) 102.216 0.06 113.292 0.09
n j Lower Upper Lower Upper Lower Upper Lower Upper
2−3 2s22p2 (3P0) 2s22p3d (3D1) 2s22p2 (3P1) 2s22p3d (3D2) 2s22p2 (3P2) 2s22p3d (3D3) 2s22p2 (1D2) 2s22p3d (1F3)
Ion λ (Å) f λ (Å) f λ (Å) f λ (Å) f
C i 1277.246 0.11 1277.283 0.08 1277.550 0.10 1463.337 0.10
N ii 533.511 0.33 533.582 0.25 533.729 0.27 574.650 0.29
O iii 305.596 0.54 305.656 0.37 305.768 0.41 320.978 0.46
Ne v 143.220 0.76 143.265 0.57 143.345 0.58 147.137 0.69
Mg vii 83.910 0.93 83.959 0.68 84.025 0.66 85.407 0.83
Si ix 55.305 1.05 55.356 0.74 55.401 0.71 56.027 0.91
S xi 39.240 1.13 39.300 0.74 39.323 0.73 39.648 0.97
Ar xiii 29.318 1.19 29.252 0.68 29.348 0.73 29.549 1.00
Ca xv 22.730 1.23 22.758 0.57 22.777 0.72 22.902 1.00
Fe xxi 12.292 1.24 12.433 0.43 12.331 0.59 12.411 0.94
n j Lower Upper (†) Lower Upper (†) Lower Upper (†) Lower Upper (†)
1−2 2s22p2 (3P0) 1s2s22p3 (3D1) 2s22p2 (3P1) 1s2s22p3 (3P1) 2s22p2 (3P2) 1s2s22p3 (3D3) 2s22p2 (1D2) 1s2s22p3 (1D2)
Ion λ (Å) f λ (Å) f λ (Å) f λ (Å) f
C i 43.567 0.09 43.568 0.08 () 43.568 0.08 () 43.492 0.17
N ii 30.963 0.11 30.944 0.10 () 30.945 0.10 () 30.914 0.21
O iii 23.056 0.13 () 23.057 0.11 () 23.058 0.11 () 23.061 0.24
Ne v 14.234 0.16 14.205 0.14 () 14.237 0.12 14.211 0.28
Mg vii 9.604 0.19 () 9.605 0.16 () 9.628 0.14 9.611 0.30
Si ix 6.912 0.21 () 6.914 0.18 6.929 0.14 6.916 0.32
S xi 5.225 0.24 5.218 0.19 5.229 0.15 5.220 0.33
Ar xiii 4.086 0.27 4.081 0.20 4.088 0.15 4.081 0.33
Ca xv 3.277 0.32 3.274 0.22 3.280 0.15 3.275 0.32
Fe xxi 1.895 0.44 1.894 0.22 () 1.894 0.17 () 1.894 0.19 ()

Notes. For the 2s−2p (nj = 2−2) and 1s−2p (nj = 1−2) transitions from the ground and metastable (lower) levels, the upper levels (marked †) vary for different element (exceptions are marked following the f-values).

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