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Table 2

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

Index 1 2 3 4
n j Lower Upper Lower Upper Lower Upper Lower Upper
2−2 2s2 (1S0) 2s2p (1P1) 2s2p (3P0) 2p2 (3P1) 2s2p (3P1) 2p2 (3P2) 2s2p (3P2) 2p2 (3P2)
Ion λ (Å) f λ (Å) f λ (Å) f λ (Å) f
C iii 977.012 0.76 1175.254 0.27 1174.923 0.11 1175.702 0.20
N iv 765.141 0.61 922.511 0.22 921.986 0.09 923.212 0.17
O v 629.727 0.50 759.436 0.19 758.671 0.08 760.440 0.14
Ne vii 465.216 0.41 559.944 0.16 558.605 0.07 561.724 0.12
Mg ix 368.068 0.31 441.196 0.12 439.173 0.05 443.969 0.09
Si xi 303.323 0.27 361.410 0.10 358.650 0.04 365.431 0.08
S xiii 256.683 0.24 303.382 0.09 299.954 0.04 308.950 0.07
Ar xv 221.133 0.21 258.764 0.08 254.827 0.04 266.239 0.06
Ca xvii 192.818 0.19 223.018 0.08 218.821 0.03 232.827 0.05
Fe xxiii 132.906 0.15 147.270 0.06 144.389 0.03 166.689 0.03
n j Lower Upper Lower Upper Lower Upper Lower Upper
2−3 2s2 (1S0) 2s3p (1P1) 2s2p (3P0) 2s3d (3D1) 2s2p (3P1) 2s3d (3D2) 2s2p (3P2) 2s3d (3D3)
Ion λ (Å) f λ (Å) f λ (Å) f λ (Å) f
C iii 386.200 0.23 459.463 0.56 459.510 0.42 459.624 0.47
N iv 247.203 0.33 283.415 0.61 283.463 0.46 283.572 0.51
O v 172.168 0.38 192.749 0.63 192.795 0.47 192.902 0.53
Ne vii 97.495 0.47 106.040 0.68 106.085 0.51 106.189 0.57
Mg ix 62.751 0.53 67.089 0.72 67.134 0.54 67.239 0.61
Si xi 43.763 0.46 46.362 0.73 46.298 0.54 46.399 0.61
S xiii 32.242 0.38 33.806 0.74 33.852 0.55 33.951 0.61
Ar xv 24.759 0.32 25.808 0.75 25.850 0.56 25.953 0.62
Ca xvii 19.558 0.36 20.310 0.78 20.339 0.56 20.437 0.62
Fe xxiii 10.980 0.41 11.298 0.74 11.325 0.54 11.441 0.61
n j Lower Upper Lower Upper (†) Lower Upper (†) Lower Upper (†)
1−2 2s2 (1S0) 1s2s22p (1P1) 2s2p (3P0) 1s2s2p2 (3P1) 2s2p (3P1) 1s2s2p2 (3P2) 2s2p (3P2) 1s2s2p2 (3P2)
Ion λ (Å) f λ (Å) f λ (Å) f λ (Å) f
C iii 42.165 0.62 42.385 0.31 42.384 0.13 42.385 0.23
N iv 29.941 0.65 30.088 0.33 30.086 0.14 30.088 0.24
O v 22.360 0.61 22.474 0.30 22.472 0.13 22.474 0.22
Ne vii 13.820 0.66 13.878 0.35 13.877 0.16 13.879 0.22
Mg ix 9.378 0.68 9.410 0.44 9.413 0.26 () 9.415 0.15 ()
Si xi 6.776 0.70 6.798 0.52 () 6.799 0.27 () 6.797 0.27
S xiii 5.123 0.71 5.137 0.56 () 5.138 0.27 () 5.136 0.28
Ar xv 4.007 0.72 4.017 0.57 () 4.018 0.27 () 4.016 0.29
Ca xvii 3.222 0.72 3.228 0.59 () 3.228 0.28 () 3.228 0.29
Fe xxiii 1.870 0.69 1.873 0.61 1.874 0.29 () 1.874 0.26

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

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