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Table 4:

The level energies (Ryd) of Ar8+ from different calculations along with the compilation of NIST v3 and CHIANTI v6.

ID 		Level specification NIST/CHIANTIa AS FAC CHIANTIb MCHFc

1 		${\rm 2s^2 2p^6 ~ ^1S_0}$   0.00000      
2 ${\rm 2s^2 2p^5 3s ~ ^3P_2}$ 18.4672 18.4701 18.4879 18.4267 18.4745
3 ${\rm 2s^2 2p^5 3s ~ ^3P_1}$ 18.5271 18.5316 18.5510 18.4823 18.5346
4 ${\rm 2s^2 2p^5 3s ~ ^3P_0}$ 18.6307 18.6318 18.6492 18.5898 18.6377
5 ${\rm 2s^2 2p^5 3s ~ ^1P_1}$ 18.6967 18.7031 18.7249 18.6463 18.7045
6 ${\rm 2s^2 2p^5 3p ~ ^3S_1}$ 19.5859 19.5907 19.6006 19.5898 19.6043
7 ${\rm 2s^2 2p^5 3p ~ ^3D_3}$ 19.7739 19.7862 19.8001 19.7404 19.7945
8 ${\rm 2s^2 2p^5 3p ~ ^3D_2}$ 19.7826 19.7955 19.8113 19.7475 19.8025
9 ${\rm 2s^2 2p^5 3p ~ ^3D_1}$ 19.8049 19.8493 19.8647 19.7960 19.8549
10 ${\rm 2s^2 2p^5 3p ~ ^3P_2}$ 19.8855 19.8968 19.9149 19.8358 19.9050
11 ${\rm 2s^2 2p^5 3p ~ ^1P_1}$ 19.9489 19.9644 19.9775 19.9104 19.9965
12 ${\rm 2s^2 2p^5 3p ~ ^3P_0}$ 19.9751 19.9910 20.0055 19.9271 20.0314
13 ${\rm 2s^2 2p^5 3p ~ ^1D_2}$ 20.0026 20.0131 20.0305 19.9587 19.9685
14 ${\rm 2s^2 2p^5 3p ~ ^3P_1}$ 20.0104 20.0245 20.0413 19.9645 20.0225
15 ${\rm 2s^2 2p^5 3p ~ ^1S_0}$ 20.7851 20.7670 20.8484 20.6289 20.6624
16 ${\rm 2s^2 2p^5 3d ~ ^3P_0}$ 21.4090 21.4282 21.4273 21.3865 21.4359
17 ${\rm 2s^2 2p^5 3d ~ ^3P_1}$ 21.4276 21.4478 21.4451 21.4038 21.4539
18 ${\rm 2s^2 2p^5 3d ~ ^3P_2}$ 21.4650 21.4876 21.4831 21.4403 21.4914
19 ${\rm 2s^2 2p^5 3d ~ ^3F_4}$ 21.4945 21.5229 21.5169 21.4640 21.5230
20 ${\rm 2s^2 2p^5 3d ~ ^3F_3}$ 21.5215 21.5488 21.5475 21.4885 21.5496
21 ${\rm 2s^2 2p^5 3d ~ ^3F_2}$ 21.5794 21.5962 21.5951 21.5314 21.5962
22 ${\rm 2s^2 2p^5 3d ~ ^1F_3}$ 21.6027 21.6352 21.6325 21.5614 21.6305
23 ${\rm 2s^2 2p^5 3d ~ ^3D_1}$ 21.6963 21.7272 21.7266 21.6480 21.7240
24 ${\rm 2s^2 2p^5 3d ~ ^1D_2}$ 21.7091 21.7380 21.7358 21.6690 21.7594
25 ${\rm 2s^2 2p^5 3d ~ ^3D_3}$ 21.7312 21.7616 21.7594 21.6918 21.7622
26 ${\rm 2s^2 2p^5 3d ~ ^3D_2}$ 21.7334 21.7652 21.7632 21.6909 21.7367
27 ${\rm 2s^2 2p^5 3d ~ ^1P_1}$ 21.9709 22.0317 22.0372 21.9433 22.0010
28 ${\rm 2s 2p^6 3s ~ ^3S_1}$   24.2031 24.2183 24.1764 24.6381
29 ${\rm 2s 2p^6 3s ~ ^1S_0}$   24.4742 24.4911 24.4184 24.7995
30 ${\rm 2s^2 2p^5 4s ~ ^3P_2}$ 24.6131 24.6443 24.6311 24.5969 24.8207
31 ${\rm 2s^2 2p^5 4s ~ ^1P_1}$ 24.6402 24.6718 24.6630 24.6187 24.6671
32 ${\rm 2s^2 2p^5 4s ~ ^3P_0}$ 24.7794 24.8031 24.7905 24.7609  
33 ${\rm 2s^2 2p^5 4s ~ ^3P_1}$ 24.7936 24.8230 24.8145 24.7746  
34 ${\rm 2s^2 2p^5 4p ~ ^3S_1}$ 25.1071 25.1267 25.1214 25.0596  
35 ${\rm 2s^2 2p^5 4p ~ ^3D_3}$ 25.1591 25.1444 25.1408 25.0981  
36 ${\rm 2s^2 2p^5 4p ~ ^3D_2}$ 25.1472 25.1500 25.1479 25.1014  
37 ${\rm 2s^2 2p^5 4p ~ ^1P_1}$ 25.1598 25.1727 25.1722 25.1203  
38 ${\rm 2s^2 2p^5 4p ~ ^3P_2}$ 25.1817 25.1843 25.1849 25.1307  
39 ${\rm 2s^2 2p^5 4p ~ ^3P_0}$ 25.2565 25.2714 25.2739 25.2097  
40 ${\rm 2s^2 2p^5 4p ~ ^3D_1}$ 25.3016 25.3050 25.3021 25.2590  
41 ${\rm 2s^2 2p^5 4p ~ ^1D_2}$ 25.3225 25.3263 25.3258 25.2787  
42 ${\rm 2s^2 2p^5 4p ~ ^3P_1}$ 25.3253 25.3285 25.3284 25.2750  
43 ${\rm 2s 2p^6 3p ~ ^3P_0}$   25.5061 25.5425 25.4653  
44 ${\rm 2s 2p^6 3p ~ ^3P_1}$ 25.3515 25.5140 25.5497 25.4727  
45 ${\rm 2s 2p^6 3p ~ ^3P_2}$   25.5355 25.5696 25.4927  
46 ${\rm 2s^2 2p^5 4p ~ ^1S_0}$ 25.5795 25.5741 25.6269 25.4414  
47 ${\rm 2s 2p^6 3p ~ ^1P_1}$ 25.4298 25.6165 25.6467 25.5656  
48 ${\rm 2s^2 2p^5 4d ~ ^3P_0}$ 25.7158 25.7514 25.7320 25.6922  
49 ${\rm 2s^2 2p^5 4d ~ ^3P_1}$ 25.7260 25.7622 25.7427 25.7023  
50 ${\rm 2s^2 2p^5 4d ~ ^3F_4}$ 25.7417 25.7728 25.7537 25.7187  
51 ${\rm 2s^2 2p^5 4d ~ ^3P_2}$ 25.7448 25.7801 25.7607 25.7205  
52 ${\rm 2s^2 2p^5 4d ~ ^3F_3}$ 25.7552 25.7857 25.7692 25.7305  
53 ${\rm 2s^2 2p^5 4d ~ ^1D_2}$ 25.7753 25.8057 25.7905 25.7478  
54 ${\rm 2s^2 2p^5 4d ~ ^3D_3}$ 25.7859 25.8163 25.8009 25.7560  
55 ${\rm 2s^2 2p^5 4d ~ ^3D_1}$ 25.8443 25.8824 25.8706 25.8135  
56 ${\rm 2s^2 2p^5 4d ~ ^3F_2}$ 25.9173 25.9460 25.9300 25.8927  
57 ${\rm 2s^2 2p^5 4d ~ ^3D_2}$ 25.9255 25.9546 25.9383 25.8973  
58 ${\rm 2s^2 2p^5 4d ~ ^1F_3}$ 25.9312 25.9595 25.9439 25.9037  
59 ${\rm 2s^2 2p^5 4f ~ ^3D_1}$ 25.9443 25.9702 25.9638 25.9250  
60 ${\rm 2s^2 2p^5 4f ~ ^3D_2}$ 25.9487 25.9754 25.9693 25.9276  

Notes. (a) Sources of NIST v3 are from the unpublished work of Shirai et al. (1999), and references therein, while that of CHIANTI v6 is from the work of Lepson et al. (2003). (b) Theoretical energies from Zhang et al. (1987). (c) MCHF data available from the website: http://atoms.vuse.vanderbilt.edu/


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