Table 1
Comparison of level energies for Si ix.
| Index | Level configurations | FAC6 | FAC1 | HFR1 | NIST |
|
|
|||||
| 1 |
1s22s22p2
|
0.0000 | 0.0000 | 0.0000 | 0.0000 |
| 2 |
1s22s22p2
|
0.3110 | 0.3110 | 0.3103 | 0.3155 |
| 3 |
1s22s22p2
|
0.7843 | 0.7842 | 0.8186 | 0.7952 |
| 4 |
1s22s22p2
|
6.9119 | 6.9092 | 6.9421 | 6.5620 |
| 5 |
1s22s22p2
|
13.1139 | 13.0982 | 13.3095 | 13.3654 |
| 6 |
1s22s2p3
|
17.1867 | 17.1885 | 17.7041 | 18.6930 |
| 7 |
1s22s2p3
|
36.5918 | 36.6003 | 36.6691 | 36.2322 |
| 8 |
1s22s2p3
|
36.5996 | 36.6081 | 36.6354 | 36.2401 |
| 9 |
1s22s2p3
|
36.6166 | 36.6251 | 36.6408 | 36.2581 |
| 10 |
1s22s2p3
|
42.9876 | 42.9907 | 43.0605 | 42.6517 |
| •11 |
1s22s2p3
|
42.9882 | 42.9912 | 43.0827 | 42.6652 |
| •12 |
1s22s2p3
|
43.0001 | 43.0032 | 43.0488 | 42.6599 |
| 13 |
1s22s2p3
|
56.4180 | 56.4480 | 56.1320 | 54.6030 |
| 14 |
1s22s2p3
|
56.7579 | 56.8027 | 56.6580 | 55.4138 |
| 15 |
1s22s2p3
|
62.7986 | 62.8230 | 62.5962 | 61.0939 |
| 16 |
1s22p4
|
85.0797 | 85.1174 | 84.8570 | 83.6601 |
| 17 |
1s22p4
|
85.6402 | 85.6778 | 85.3876 | 84.2200 |
| 18 |
1s22p4
|
85.8237 | 85.8611 | 85.6127 | 84.4431 |
| 19 |
1s22p4
|
91.7466 | 91.7814 | 91.0718 | 89.2069 |
| 20 |
1s22p4
|
104.6293 | 104.6604 | 103.8140 | 101.6285 |
| 21 |
1s2s22p3
|
1770.4975 | 1773.7723 | 1773.8817 | |
| 22 |
1s2s22p3
|
1784.7499 | 1787.4198 | 1788.2761 | |
| 23 |
1s2s22p3
|
1784.8997 | 1787.5480 | 1788.1941 | |
| 24 |
1s2s22p3
|
1784.9242 | 1787.5755 | 1788.1998 | |
| 25 |
1s2s22p3
|
1788.4156 | 1790.7066 | 1791.5719 | |
| 26 |
1s2s22p3
|
1789.2415 | 1791.4397 | 1792.4497 | |
| 27 |
1s2s22p3
|
1789.3511 | 1791.5274 | 1792.4240 | |
| 28 |
1s2s22p3
|
1789.4253 | 1791.6428 | 1792.6255 | |
| 29 |
1s2s22p3
|
1793.9727 | 1796.1568 | 1797.2570 | |
| 30 |
1s2s22p3
|
1798.3268 | 1800.0376 | 1801.3853 | |
| 31 |
1s(2S)2s2p4(4P)
|
1802.5020 | 1804.8182 | 1804.7629 | |
| 32 |
1s(2S)2s2p4(4P)
|
1803.1056 | 1805.4265 | 1805.2733 | |
| 33 |
1s(2S)2s2p4(4P)
|
1803.4485 | 1805.7751 | 1805.5979 | |
| 34 |
1s(2S)2s2p4(4P)
|
1822.8326 | 1824.4463 | 1824.9594 | |
| •35 |
1s(2S)2s2p4(4P)
|
1823.3024 | 1824.9486 | 1825.8293 | |
| •36 |
1s(2S)2s2p4(2D)
|
1823.4531 | 1825.6564 | 1825.8344 | |
| 37 |
1s(2S)2s2p4(4P)
|
1823.6638 | 1825.8244 | 1825.6722 | |
| •38 |
1s(2S)2s2p4(2D)
|
1823.6697 | 1825.2575 | 1825.7697 | |
| •39 |
1s(2S)2s2p4(2D)
|
1823.7625 | 1825.8952 | 1825.3947 | |
| 40 |
1s(2S)2s2p4(2S)
|
1833.6867 | 1835.3161 | 1835.7917 | |
| 41 |
1s(2S)2s2p4(2D)
|
1836.4113 | 1838.2599 | 1838.9041 | |
| 42 |
1s(2S)2s2p4(2P)
|
1838.2168 | 1840.6016 | 1840.4812 | |
| 43 |
1s(2S)2s2p4(2P)
|
1838.7842 | 1841.1781 | 1840.9210 | |
| 44 |
1s(2S)2s2p4(2P)
|
1838.9370 | 1841.3274 | 1841.0937 | |
| 45 |
1s(2S)2s2p4(2P)
|
1845.7907 | 1847.8227 | 1847.5927 | |
| 46 |
1s(2S)2s2p4(2S)
|
1846.7293 | 1848.0086 | 1849.1591 | |
| 47 |
1s2p5
|
1869.2117 | 1871.5190 | 1870.9739 | |
| 48 |
1s2p5
|
1869.8556 | 1872.1694 | 1871.5886 | |
| 49 |
1s2p5
|
1870.3230 | 1872.6383 | 1871.9329 | |
| 50 |
1s2p5
|
1878.3528 | 1880.3785 | 1879.8982 | |
Notes. FAC6: level energies computed by largest configurations included in the FAC code. FAC1: level energies computed by only n = 2 configurations included in the FAC code. HFR1: level energies computed by only n = 2 configurations included in the HFR code from Palmeri et al. (2008). NIST: level energies compiled in the NIST database 30. •: level orderings changed compared to the results of Palmeri et al. (2008).
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