Recombination Lines of Atomic Hydrogen:

Balmer Series

VACUUM VACUUM
TRANSITION WAVELENGTH FREQUENCY I/I(Hbeta)
(Nu-Nl) (microns) (cm -1) Te=Ne=10**4
3-2 0.656315237. 2.85
4-2 0.486120572.1.00

Intensities from Hummer & Storey, MNRAS 224, 801
most frequencies calculated from f = 109677.57 * [(1/Nl)**2 - TRG