Thorium Th II

Odd Levels		Even levels
5f7s2 2F5/2 4 490 5f6d7s 4H7/2 6 168 5f6d2 4H7/2 12 486 6d7s7p 4F3/2 23 373 6d27p 28 244? 7s27p 2P1/2 31 626 5f27p 4I9/2 49 496? 5f7p2 4G5/2 54 360? 5f3 4I9/2 55 000 ± 5 000		6d27s 4F3/2 0* 6f7s2 2D3/2 1 860* 6d3 4F3/2 7 001 5f27s 4H7/2 24 382 5f7s7p 4G5/2 26 489 5f6d7p 4I9/2 30 453 5f26d 4K11/2 32 620

* Due to a strong multiconfiguration mixing, the indicated configuration accounts for less than 50 % of the eigenfunction.