Table 1.
Level energies and ionization potential (IP; in eV) for the isolated atom (IA) and screened atom of C4+ embedded in C plasmas at an electron temperature and density of 120 eV and 4.3 × 1022 cm−3 (A), 189 eV and 8.7 × 1022 cm−3 (B), 250 eV and 2.1 × 1023 cm−3 (C), 303 eV and 4.3 × 1023 cm−3 (D), and 373 eV and 1.1 × 1024 cm−3 (E).
| Level | Energy (eV) |
|||||
|---|---|---|---|---|---|---|
| IA (NIST) (a) | A | B | C | D | E | |
| 1s2 1S0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| 1s1/22s1/2 3S1 | 298.960 | 298.094 | 297.626 | 295.987 | 294.491 | … |
| 1s1/22s1/2 1S0 | 304.384 | 303.643 | 303.115 | 301.061 | 299.242 | … |
 |
304.401 | 303.547 | 303.178 | 302.128 | 300.054 | … |
 |
304.402 | 303.536 | 303.167 | 302.323 | 300.364 | … |
 |
304.418 | 303.569 | 303.199 | 301.812 | 300.882 | … |
 |
307.899 | 307.477 | 307.066 | 305.556 | 303.659 | … |
| IP 1s1/2 2S1/2 | 392.091 | 349.545 | 340.157 | 325.109 | 309.762 | 291.666 |
Notes. The temperature and electron-density values for C plasmas are deduced from the standard solar model (Bahcall & Ulrich 1988; Guenther et al. 1992).
The NIST values are listed for IA (Kramida et al. 2020).
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