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Hydrogen Recombination Lines

Below is a list of Paschen, Brackett, Pfund, and Humphreys series lines of atomic hydrogen in the 1-5µm region. Some of these lines are prominent in R~1000 spectra of A0V stars. Wavelengths are in vacuum

SERIES TRANSITION WAVELENGTH (µm)
Paschen 4-3 1.87561
Paschen 5-3 1.28216
Paschen 6-3 1.09411
Paschen 7-3 1.00521
Paschen 8-3 0.95486
Paschen 9-3 0.92315
Paschen 10-3 0.90174
Brackett 5-4 4.05226
Brackett 6-4 2.62587
Brackett 7-4 2.16612
Brackett 8-4 1.94509
Brackett 9-4 1.81791
Brackett 10-4 1.73669
Brackett 11-4 1.68111
Brackett 12-4 1.64117
Brackett 13-4 1.61137
Brackett 14-4 1.58849
Brackett 15-4 1.57050
Brackett 16-4 1.55607
Brackett 17-4 1.54431
Brackett 18-4 1.53460
Brackett 19-4 1.52647
Brackett 20-4 1.51960
Brackett 21-4 1.51374
Pfund 7-5 4.65378
Pfund 8-5 3.74056
Pfund 9-5 3.29699
Pfund 10-5 3.03920
Pfund 11-5 2.87300
Pfund 11-5 2.87300
Pfund 12-5 2.75827
Pfund 13-5 2.67513
Pfund 14-5 2.61265
Pfund 15-5 2.56433
Pfund 16-5 2.52609
Pfund 17-5 2.49525
Pfund 18-5 2.46999
Pfund 19-5 2.44900
Pfund 11-5 2.87300
Humphreys 10-6 5.12865
Humphreys 11-6 4.67251
Humphreys 13-6 4.17080
Humphreys 14-6 4.02087
Humphreys 15-6 3.90755
Humphreys 16-6 3.81945
Humphreys 17-6 3.74940
Humphreys 18-6 3.69264
Humphreys 19-6 3.64593
Humphreys 20-6 3.60697
Humphreys 21-6 3.57410
Humphreys 22-6 3.54610
Humphreys 23-6 3.52203
Humphreys 24-6 3.50116
Humphreys 25-6 3.48296