.5    [79460.   ]            3s2 3p3 2P               3s2 3p3 2P                       
   1.5         0.                3s2 3p3 4S               3s2 3p3 4S                       
   1.5    [43650.   ]            3s2 3p3 2D               3s2 3p3 2D                       
   1.5    [88170.   ]            3s2 3p3 2P               3s2 3p3 2P                       
   2.5    [49690.   ]            3s2 3p3 2D               3s2 3p3 2D