Selected  Spectral  Series  Wavelengths  for  Hydrogen and Hydrogen-like Ions  (λmn are given in Å)

Series m Lyman (n=1) Balmer (n=2) Paschen (n=3) Brackett (n=4) Pfund (n=5) Humphreys (n=6) Pickering (He+, n=4)
2 1215.67           (Compare λs with those
of the Balmer series
.)
3 1025.72 6562.80        
4 972.537 4861.32 18751.0      
5 949.743 4340.46 12818.1 40512.0     10123.64
6 937.803 4101.73 10938.1 26252.0 74578   6560.10
7 930.748 3970.07 10049.4 21655.0 46525 123680 5411.52
8 926.226 3889.05 9545.98 19455.6 37395 75005 4859.32
9 923.150 3835.38 9229.02 18174.1 32961 59066 4541.59
10 920.963 3797.90 9014.91 17362.1 30384 51273 4338.67
11 919.352 3770.63 8862.79 16806.5 28722 46712 4199.83
12 918.129 3750.15 8750.47 16407.2 27575 43753 4100.04
13 917.181 3734.37 8665.02 16109.3 26744 41697 4025.60
14 916.429 3721.94 8598.39 15880.5 26119 40198 3968.43
15 915.824 3711.97 8545.39 15700.7 25636 39065 3923.48
16 915.329 3703.85 8502.49 15556.5 25254 38184 3887.44
17 914.919 3697.15 8467.26 15438.9 24946 37484 3858.07
18 914.576 3691.55 8437.96 15341.8 24693 36916 3833.80
19 914.286 3686.83 8413.32 15260.6 24483 36449 3813.50
20 914.039 3682.81 8392.40 15191.8 24307 36060 3796.33
21 913.826 3679.35 8374.51       3781.68
¥ 911.5 3646.0 8206.6 14584 22788 32814 3644.67

Note that, letting λB = the Balmer Series wavelengths and λP = the Pickering Series wavelengths, λ » λ ,  λ » λBβ , . . . , λP(2n) » λBn , . . . .