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Erbium (Er) 
Int. Wavelength Aki Energy Configuration Term J Line Aki
(Å) (108s-1) Levels (cm-1) Ref. Ref.
200 3230.582 1.5 440.434 4f12(3H6)6s1/2 (6,1/2) 11/2 M64b K91
31385.667 ° 11/2
250 3264.782 0.58 0.000 4f12(3H6)6s1/2 (6,1/2) 13/2 M64b K91
30621.102 4f12(3H6)6p3/2? (6,3/2)°? 13/2
200 3312.424 0.37 440.434 4f12(3H6)6s1/2 (6,1/2) 11/2 M64b K91
30621.102 4f12(3H6)6p3/2? (6,3/2)°? 13/2
700 3372.71 1.3 0.000 4f12(3H6)6s1/2 (6,1/2) 13/2 M64b K91
29640.863 4f12(3H6)6p3/2? (6,3/2)°? 15/2
200 3391.998 0.235 0.000 4f12(3H6)6s1/2 (6,1/2) 13/2 M64b K91
29472.789 ° 15/2
600 3499.104 0.75 440.434 4f12(3H6)6s1/2 (6,1/2) 11/2 M64b K91
29011.015 4f12(3H6)6p3/2? (6,3/2)°? 9/2
300 3616.565 0.20 0.000 4f12(3H6)6s1/2 (6,1/2) 13/2 M64b K91
27642.658 ° 11/2
700 3692.650 0.48 440.434 4f12(3H6)6s1/2 (6,1/2) 11/2 M64b K91
27513.555 ° 13/2
300 3830.482 0.14 0.000 4f12(3H6)6s1/2 (6,1/2) 13/2 M64b K91
26098.972 4f12(3H6)6p1/2? (6,1/2)°? 13/2
500 3896.234 0.18 440.434 4f12(3H6)6s1/2 (6,1/2) 11/2 M64b K91
26098.972 4f12(3H6)6p1/2? (6,1/2)°? 13/2
1000 3906.311 0.323 0.000 4f12(3H6)6s1/2 (6,1/2) 13/2 M64b K91
25592.343 4f12(3H6)6p1/2? (6,1/2)°? 11/2
200 3938.626 0.000 4f12(3H6)6s1/2 (6,1/2) 13/2 M64b
25382.379 ° 11/2