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Table 1

Target levels of Si xi and their threshold energies (in eV). The complete table is available at the CDS.

Index Configuration J π FAC1 FAC2 HFR1 NIST

1 0e 0.0000 0.0000 0.0000 0.0000
2 0o 21.3327 21.2349 21.0968 21.0528
3 1o 21.6157 21.5185 21.4031 21.3431
4 2o 22.2423 22.1472 22.0448 21.9846
5 1o 42.6349 41.8458 41.9400 40.8750
6 0e 55.7574 55.6194 55.1390 55.0081
7 1e 56.0952 55.9604 55.4830 55.3582
8 2e 56.6373 56.5043 56.0737 55.9125
9 2e 63.2840 62.6257 62.2403 61.3971
10 0e 77.9901 77.3522 76.7322 75.4764
11 0o 1818.1021 1816.7572 1817.9239
12 1o 1818.2944 1816.8417 1818.2763
13 2o 1819.0477 1817.6862 1819.0625
14 1e 1822.9172 1821.7062 1822.5031
15 1s1 / 22s1 / 22p1 / 22p3 / 2 2e 1823.2833 1822.0689 1822.9144
16 3e 1823.7399 1822.5149 1823.5003
17 1o 1828.4606 1827.5392 1828.8896 1828.6100
•18 1s1 / 22s1 / 22p1 / 22p3 / 2 3e 1844.7829 1844.1929 1845.1206 1844.8200
•19 1s1 / 22s1 / 22p1 / 22p3 / 2 2e 1844.9714 1844.2053 1845.1918 1844.5600
•20 1s1 / 22s1 / 22p1 / 22p3 / 2 1e 1845.2521 1844.1961 1845.1263 1844.6500
•21 1s1 / 22s1 / 22p1 / 22p3 / 2 0e 1845.3862 1844.2107 1845.3437 1844.4500
22 1e 1845.7068 1844.7107 1845.6215 1845.2300
23 2e 1845.9554 1845.2402 1846.1785 1845.8100
24 1e 1855.8317 1855.2865 1856.1045
•25 1s1 / 22s1 / 22p1 / 22p3 / 2 2e 1859.3489 1858.4128 1859.6729
•26 2o 1859.4064 1858.6252 1858.7365 1858.5600
27 1s1 / 22s1 / 22p1 / 22p3 / 2 0e 1860.5086 1859.0153 1860.1826
28 1s1 / 22s1 / 22p1 / 22p3 / 2 1e 1860.8798 1859.3893 1860.5703
29 2e 1861.3770 1859.9040 1861.2197 1859.6600
30 1s1 / 22s1 / 22p1 / 22p3 / 2 1e 1869.0812 1867.9143 1869.0402 1867.4000
31 0e 1869.9258 1869.6685 1870.6435
•32 3o 1874.3605 1873.3319 1873.6642
33 2o 1874.5742 1873.5519 1873.6241
•34 1o 1874.5947 1873.5715 1873.6184
35 1o 1878.6887 1878.3633 1878.2305
36 2o 1883.8960 1883.1171 1883.1831 1881.6200
•37 1o 1884.8907 1884.1622 1884.2532
•38 0o 1884.9585 1884.2338 1884.1787
39 2o 1885.1943 1884.4478 1884.5571 1883.2000
40 1o 1894.5676 1894.0804 1894.0634 1892.2300

Notes. FAC1: level energies computed by 40 levels involved with FAC code. FAC2: level energies computed by 680 levels involved with FAC code. HFR1: level energies computed by 40 levels involved with HFR code from Palmeri et al. (2008). NIST: level energies compiled in NIST database 1. •: levels with orderings changed by inclusion Breit effects.

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