Table 3.
Energy (cm−1), A-value (s−1), Υ (at 4.41 × 106 K), and Υ (at ∞) for levels 2s 2p2 3s, 3P1 (#78 in the present work) and 2s 2p2 3d, 5D1 (#79) of Fe XXI.
| ID | λ (3s) | Energy (#78) | A(21–78) | Υ(21 − 78) | Υ(21 − 78) |
|---|---|---|---|---|---|
| (cm−1) | (s−1) | at 4.41 × 106 K | at ∞ | ||
| A | 1.26889 | 8577023 | 9.17 × 109 | 9.67 × 10−2 | 2.67 × 10−2 |
| B | 1.38480 | 8573268 | 1.47 × 1010 | 1.54 × 10−1 | 4.28 × 10−2 |
| C | 1.26986 | 8576789 | 7.69 × 109 | 8.12 × 10−2 | 2.24 × 10−2 |
| CHIANTI | – | 8664021 (#97) | 2.59 × 109 | – | – |
| SPEX | – | 8547294 (#80) | 1.36 × 109 | – | – |
| ID | λ (3d) | Energy (#79) | A(21–79) | Υ(21 − 79) | Υ(21 − 79) |
| A | 1.30384 | 8577328 | 5.92 × 109 | 6.18 × 10−2 | 1.72 × 10−2 |
| B | 1.39690 | 8574110 | 4.30 × 108 | 4.50 × 10−3 | 1.25 × 10−3 |
| C | 1.30830 | 8577085 | 7.40 × 109 | 7.73 × 10−2 | 2.15 × 10−2 |
| CHIANTI | – | 8664020 (#78) | 2.59 × 109 | – | – |
| SPEX | – | 8547294 (#78) | 1.36 × 109 | – | – |
Notes. The scaling parameters of 3s and 3d, most relevant to the “long island” shown in Fig. 4, are also tabulated. Data set A is the default of the present work. In data set B, we use the scaling parameters of Fernández-Menchero et al. (2016). In data set C, we use a third set of scaling parameters (see Fig. 3). For CHIANTI, database v9.0 (Dere et al. 2019) is used and 620 energy levels are included for Fe XXI. Theoretical energy levels #78 and #97 are collected from Landi & Gu (2006). For SPEX, database SPEXACT v3.05 (Kaastra et al. 2018) is used and 1400 energy levels are included for Fe XXI. No information of levels #21 2s2 2p 3s, (3P0), 2s 2p2 3s, (3P1), and 2s 2p2 3d, (5D1) are available in NIST v5.6.1 (Kramida et al. 2018).
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