\begin{table}%t12 %\centering \par \caption{\label{tab_energy_kr}The level energies (Ryd) of Kr$^{26+}$ from different calculations along with the compilation of NIST v3. } {\tiny \begin{tabular}{cccccc} \hline\hline \noalign{\smallskip} ID & Level~specification & NIST\tablefootmark{a} & AS & FAC & MCDF\tablefootmark{b} \\ \hline\noalign{\smallskip} 1 & ${\rm 2s^2 2p^6 ~ ^1S_0}$ & & 0.000 & & \\ 2 & ${\rm 2s^2 2p^5 3s ~ ^3P_2}$ & 121.204 & 121.384 & 121.242 & 121.192 \\ 3 & ${\rm 2s^2 2p^5 3s ~ ^1P_1}$ & 121.441 & 121.592 & 121.482 & 121.426 \\ 4 & ${\rm 2s^2 2p^5 3p ~ ^3S_1}$ & 124.966 & 125.274 & 125.019 & 124.964 \\ 5 & ${\rm 2s^2 2p^5 3s ~ ^3P_0}$ & 125.284 & 125.452 & 125.283 & 125.303 \\ 6 & ${\rm 2s^2 2p^5 3p ~ ^3D_2}$ & 125.194 & 125.503 & 125.250 & 125.200 \\ 7 & ${\rm 2s^2 2p^5 3s ~ ^3P_1}$ & 125.399 & 125.562 & 125.406 & 125.430 \\ 8 & ${\rm 2s^2 2p^5 3p ~ ^3D_3}$ & 126.041 & 126.352 & 126.097 & 126.072 \\ 9 & ${\rm 2s^2 2p^5 3p ~ ^1P_1}$ & 126.084 & 126.370 & 126.136 & 126.100 \\ 10 & ${\rm 2s^2 2p^5 3p ~ ^3P_2}$ & 126.397 & 126.686 & 126.449 & 126.410 \\ 11 & ${\rm 2s^2 2p^5 3p ~ ^3P_0}$ & 127.618 & 127.907 & 127.633 & 127.588 \\ 12 & ${\rm 2s^2 2p^5 3p ~ ^3D_1}$ & 129.175 & 129.491 & 129.194 & 129.225 \\ 13 & ${\rm 2s^2 2p^5 3p ~ ^3P_1}$ & 130.192 & 130.485 & 130.208 & 130.241 \\ 14 & ${\rm 2s^2 2p^5 3p ~ ^1D_2}$ & 130.280 & 130.582 & 130.302 & 130.347 \\ 15 & ${\rm 2s^2 2p^5 3d ~ ^3P_0}$ & 130.694 & 131.065 & 130.788 & 130.745 \\ 16 & ${\rm 2s^2 2p^5 3p ~ ^1S_0}$ & 130.742 & 131.105 & 130.936 & 130.908 \\ 17 & ${\rm 2s^2 2p^5 3d ~ ^3P_1}$ & 130.945 & 131.257 & 130.961 & 130.936 \\ 18 & ${\rm 2s^2 2p^5 3d ~ ^3F_3}$ & 131.173 & 131.523 & 131.236 & 131.232 \\ 19 & ${\rm 2s^2 2p^5 3d ~ ^3P_2}$ & 131.233 & 131.589 & 131.282 & 131.266 \\ 20 & ${\rm 2s^2 2p^5 3d ~ ^3F_4}$ & 131.214 & 131.622 & 131.267 & 131.274 \\ 21 & ${\rm 2s^2 2p^5 3d ~ ^1D_2}$ & 131.445 & 131.803 & 131.510 & 131.496 \\ 22 & ${\rm 2s^2 2p^5 3d ~ ^3D_3}$ & 131.664 & 132.059 & 131.728 & 131.723 \\ 23 & ${\rm 2s^2 2p^5 3d ~ ^3D_1}$ & 132.476 & 132.866 & 132.553 & 132.551 \\ 24 & ${\rm 2s^2 2p^5 3d ~ ^3F_2}$ & 135.260 & 135.550 & 135.239 & 135.304 \\ 25 & ${\rm 2s^2 2p^5 3d ~ ^3D_2}$ & 135.426 & 135.816 & 135.458 & 135.522 \\ 26 & ${\rm 2s^2 2p^5 3d ~ ^1F_3}$ & 135.531 & 135.929 & 135.567 & 135.640 \\ 27 & ${\rm 2s^2 2p^5 3d ~ ^1P_1}$ & 136.065 & 136.470 & 136.152 & 136.226 \\ 28 & ${\rm 2s 2p^6 3s ~ ^3S_1}$ & & 139.301 & 138.999 & 139.030 \\ 29 & ${\rm 2s 2p^6 3s ~ ^1S_0}$ & & 140.228 & 139.784 & 139.808 \\ 30 & ${\rm 2s 2p^6 3p ~ ^3P_0}$ & & 143.315 & 142.899 & 142.923 \\ 31 & ${\rm 2s 2p^6 3p ~ ^3P_1}$ & 142.715 & 143.393 & 142.973 & 143.005 \\ 32 & ${\rm 2s 2p^6 3p ~ ^3P_2}$ & & 144.298 & 143.888 & 143.939 \\ 33 & ${\rm 2s 2p^6 3p ~ ^1P_1}$ & 143.835 & 144.486 & 144.090 & 144.137 \\ 34 & ${\rm 2s 2p^6 3d ~ ^3D_1}$ & & 149.200 & 148.746 & 148.814 \\ 35 & ${\rm 2s 2p^6 3d ~ ^3D_2}$ & & 149.283 & 148.804 & 148.884 \\ 36 & ${\rm 2s 2p^6 3d ~ ^3D_3}$ & & 149.470 & 148.935 & 149.027 \\ 37 & ${\rm 2s 2p^6 3d ~ ^1D_2}$ & 149.295 & 150.012 & 149.526 & 149.623 \\ 38 & ${\rm 2s^2 2p^5 4s ~ ^3P_2}$ & & 164.741 & 164.395 & 164.361 \\ 39 & ${\rm 2s^2 2p^5 4s ~ ^1P_1}$ & 164.388 & 164.798 & 164.476 & 164.439 \\ 40 & ${\rm 2s^2 2p^5 4p ~ ^3S_1}$ & & 166.296 & 165.965 & 165.929 \\ 41 & ${\rm 2s^2 2p^5 4p ~ ^3D_2}$ & & 166.352 & 166.029 & 165.992 \\ 42 & ${\rm 2s^2 2p^5 4p ~ ^3D_3}$ & & 166.663 & 166.375 & 166.350 \\ 43 & ${\rm 2s^2 2p^5 4p ~ ^1P_1}$ & & 166.670 & 166.396 & 166.367 \\ 44 & ${\rm 2s^2 2p^5 4p ~ ^3P_2}$ & & 166.771 & 166.503 & 166.469 \\ 45 & ${\rm 2s^2 2p^5 4p ~ ^1S_0}$ & & 167.275 & 167.045 & 166.996 \\ 46 & ${\rm 2s^2 2p^5 4d ~ ^3P_0}$ & & 168.441 & 168.136 & 168.116 \\ 47 & ${\rm 2s^2 2p^5 4d ~ ^3P_1}$ & 168.120 & 168.512 & 168.204 & 168.190 \\ 48 & ${\rm 2s^2 2p^5 4d ~ ^3F_3}$ & & 168.591 & 168.295 & 168.284 \\ 49 & ${\rm 2s^2 2p^5 4d ~ ^3D_2}$ & & 168.629 & 168.324 & 168.310 \\ 50 & ${\rm 2s^2 2p^5 4d ~ ^3F_4}$ & & 168.644 & 168.319 & 168.314 \\ 51 & ${\rm 2s^2 2p^5 4d ~ ^1D_2}$ & & 168.699 & 168.401 & 168.388 \\ 52 & ${\rm 2s^2 2p^5 4d ~ ^3D_3}$ & & 168.793 & 168.484 & 168.473 \\ 53 & ${\rm 2s^2 2p^5 4s ~ ^3P_0}$ & & 168.824 & 168.451 & 168.493 \\ 54 & ${\rm 2s^2 2p^5 4s ~ ^3P_1}$ & 168.376 & 168.833 & 168.470 & 168.510 \\ 55 & ${\rm 2s^2 2p^5 4d ~ ^1P_1}$ & 168.738 & 169.136 & 168.851 & 168.844 \\ 56 & ${\rm 2s^2 2p^5 4f ~ ^3D_1}$ & & 169.620 & 169.348 & 169.319 \\ 57 & ${\rm 2s^2 2p^5 4f ~ ^1G_4}$ & & 169.649 & 169.370 & 169.350 \\ 58 & ${\rm 2s^2 2p^5 4f ~ ^3D_2}$ & & 169.661 & 169.386 & 169.359 \\ 59 & ${\rm 2s^2 2p^5 4f ~ ^3G_5}$ & & 169.697 & 169.397 & 169.377 \\ 60 & ${\rm 2s^2 2p^5 4f ~ ^3F_3}$ & & 169.711 & 169.440 & 169.414 \\ \hline \end{tabular}} \tablefoot{\tablefootmark{a}{Sources of the NIST v3 compilation are from the work of %Saloman ( \citet{Sal07} and references therein. } \tablefoottext{b}{MCDF data is from the work of \citet{GBM08}.}} \end{table}