Table 2
Wavelengths (in Å) and line strengths (in au) for selected transitions of Fe XVIII compared with available data.
| Lower | Upper | λNIST | λ | λSi | SNIST | Spresent | SSi | SNahar |
|---|---|---|---|---|---|---|---|---|
| Electric dipole (E1) transitions | ||||||||
| 2s22p5 2P3∕2 |  |
16.072 | 16.080 | 16.076 | 1.10E−03 | 9.625E−04 | 1.02E−03 | 1.04E−03 |
| 2s 2p6 2 S1∕2 | 93.926 | 92.911 | 93.929 | 7.47E−02 | 6.648E−02 | 6.35E−02 | 6.34E−02 | |
 |
13.919 | 13.917 | – | 5.10E−04 | 3.107E−04 | – | 2.83E−04 | |
 |
15.847 | 15.879 | 15.874 | 7.90E−04 | 6.861E−04 | 6.78E−04 | 7.38E−04 | |
 |
15.209 | 15.257 | 15.250 | 9.70E−04 | 7.482E−04 | 7.64E−04 | 7.26E−04 | |
 |
13.954 | 14.131 | 13.957 | 8.90E−03 | 8.474E−03 | 8.40E−03 | 8.00E−03 | |
 |
15.625 | 15.627 | 15.627 | 1.20E−02 | 1.058E−02 | 1.10E−02 | 1.09E−02 | |
 |
15.766 | 15.774 | 15.767 | 5.40E−03 | 4.344E−03 | 4.54E−03 | 4.47E−03 | |
 |
14.152 | 14.196 | 14.153 | 2.40E−02 | 1.990E−02 | 1.92E−02 | 1.98E−02 | |
 |
14.256 | 14.253 | 14.259 | 4.60E−02 | 4.038E−02 | 4.07E−02 | – | |
 |
14.203 | 14.203 | 14.210 | 1.10E−01 | 1.043E−01 | 1.04E−01 | 1.03E−01 | |
| 2s22p5 2P1∕2 | 2s2p6 2S1∕2 | 103.939 | 102.691 | 103.95 | 3.67E−02 | 3.267E−02 | 3.12E−02 | 3.11E−02 |
 |
15.450 | 15.501 | 15.492 | 4.00E−03 | 3.033E−03 | 3.12E−03 | 3.12E−03 | |
 |
15.870 | 15.872 | 15.872 | 1.00E−02 | 8.962E−03 | 9.42E−03 | 9.36E−03 | |
 |
16.026 | 16.033 | 16.026 | 6.10E−03 | 5.230E−03 | 5.47E−03 | 5.44E−03 | |
 |
14.469 | 14.465 | 14.470 | 8.10E−03 | 7.861E−03 | 7.70E−03 | – | |
 |
14.418 | 14.413 | 14.420 | 1.90E−02 | 1.619E−02 | 1.56E−02 | 1.55E−02 | |
 |
14.152 | 14.119 | 14.123 | 8.30E−02 | 7.313E−02 | 7.17E−02 | 7.36E−02 | |
 |
14.361 | 14.165 | 14.361 | 8.80E−02 | 7.861E−02 | 7.93E−02 | 7.75E−02 | |
| 2s2p6 2S1∕2 |  |
– | 18.556 | 18.515 | – | 1.465E−05 | 1.19E−05 | – |
 |
– | 18.450 | 18.410 | – | 1.049E−05 | 8.32E−06 | – | |
| Electric quadrupole (E2) transitions | ||||||||
| 2s22p5 2P3∕2 | 2s22p5 2P1∕2 | 974.86 | 975.553 | 974.42 | 3.00E−03 | 3.131E−03 | – | 2.08E−03 |
 |
– | 15.459 | 15.466 | – | 6.746E−04 | 6.84E−04 | 3.74E−04 | |
 |
– | 15.467 | 15.458 | – | 6.550E−04 | 6.36E−04 | 4.47E−04 | |
 |
– | 15.393 | 15.393 | – | 8.320E−04 | 8.44E−04 | 5.34E−04 | |
| 2s2 2p5 2 P1∕2 |  |
– | 15.628 | 15.625 | – | 2.044E−03 | 2.93E−04 | – |
| 2s 2p6 2 S1∕2 |  |
– | 19.445 | – | 3.948E−06 | – | 3.33E−06 | |
| Magnetic dipole (M1) transitions | ||||||||
| 2s22p5 2P3∕2 | 2s22p5 2P1∕2 | 974.86 | 975.553 | 974.42 | 1.33E+00 | 1.328E+00 | 1.33E+00 | 1.33E+00 |
 |
– | 15.467 | – | 1.642E−04 | – | 1.61E−04 | ||
| 2s 2p6 2 S1∕2 |  |
– | 19.346 | – | 1.625E−07 | – | 2.13E−07 | |
 |
 |
– | 3793.195 | – | 1.344E+00 | – | 1.44E+00 | |
 |
– | 1037.398 | – | 2.092E+00 | – | 2.01E+00 | ||
Notes. The results of the transition wavelengths (λ) and line strengths (s) from our Emu CI calculations are compared with the values from the NISI compilation (Kramida et al. 2019), Si et al. (2016), and Nahar (2006).
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