1 1 1s 2 0 S 0.5 2 0.000 0.000000 0.000 0.000000 2 2 2s 2 0 S 0.5 2 26764198.000 243.893326 26764604.394 243.897034 3 3 2p 2 1 P 0.5 2 26759432.000 243.849899 26763341.853 243.885529 4 3 2p 2 1 P 1.5 4 26802466.000 244.242050 26802184.266 244.239487 5 5 3p 2 1 P 0.5 2 31732214.000 289.165222 31732726.011 289.169891 6 4 3s 2 0 S 0.5 2 31732606.000 289.168793 31733104.438 289.173340 7 6 3d 2 2 D 1.5 4 31743708.000 289.269958 31744226.191 289.274689 8 5 3p 2 1 P 1.5 4 31743728.000 289.270142 31744239.587 289.274811 9 6 3d 2 2 D 2.5 6 31747512.000 289.304626 31748023.863 289.309296 10 8 4p 2 1 P 0.5 2 33469894.000 305.000122 33470432.121 305.005035 11 7 4s 2 0 S 0.5 2 33470058.000 305.001617 33470589.520 305.006470 12 9 4d 2 2 D 1.5 4 33474740.000 305.044281 33475281.353 305.049225 13 8 4p 2 1 P 1.5 4 33474750.000 305.044373 33475284.702 305.049255 14 9 4d 2 2 D 2.5 6 33476348.000 305.058929 33476882.135 305.063812 15 10 4f 2 3 F 2.5 6 33476344.000 305.058899 33476882.135 305.063812 16 10 4f 2 3 F 3.5 8 33477144.000 305.066193 33477682.526 305.071106 17 12 5p 2 1 P 0.5 2 34273516.000 312.323273 34274065.019 312.328278 18 11 5s 2 0 S 0.5 2 34273600.000 312.324036 34274145.393 312.329010 19 13 5d 2 2 D 1.5 4 34275996.000 312.345856 34276546.567 312.350891 20 12 5p 2 1 P 1.5 4 34276000.000 312.345886 34276549.916 312.350922 21 14 5f 2 3 F 2.5 6 34276820.000 312.353363 34277367.052 312.358368 22 13 5d 2 2 D 2.5 6 34276820.000 312.353363 34277367.052 312.358368 23 15 5g 2 4 G 3.5 8 34277228.000 312.357086 34277775.619 312.362091 24 14 5f 2 3 F 3.5 8 34277228.000 312.357086 34277775.619 312.362091 25 15 5g 2 4 G 4.5 10 34277540.000 312.359924 34278020.090 312.364319 -1 %filename: ar_18.elvlc %observed energy levels (levels 3,4): Phillips, K.J.H., Sylwester, J., Sylwester, B., Landi, E. 2003, ApJ, 589, L113 %observed energy levels (all other levels): Ralchenko, Yu., Kramida, A.E., Reader, J., and NIST ASD Team (2008). NIST Atomic Spectra Database (version 3.1.5), [Online]. Available: http://physics.nist.gov/asd3 [2010, July 6]. National Institute of Standards and Technology, Gaithersburg, MD %theoretical energy levels: Aggarwal, K.M., Hamada, K., Igarashi, A., Jonauskas, V., Keenan, F.P., & Nakazaki, S. 2008, A&A, 487, 388 %comment: 35699780 Limit %comment: theoretical energy levels are taken from the GRASP calculations with QED corrections %produced as part of the Arcetri/Cambridge/NRL 'CHIANTI' atomic data base collaboration % % Enrico Landi - July 2010 -1