# Balmer Series

A series of lines in the emission spectrum of hydrogen that involve transitions to the n=2 state from states with n>2. Four of the lines are in the visible spectrum, and the remainder are in the ultraviolet. First discovered by Balmer in 1885.

- The frequency of the visible lines is given by:

- where
*R*= Rydberg constant for hydrogen = 1.097x10_{H}^{7}m^{-1}*c*= velocity of light = 2.997924580x10^{8}ms^{-1}*n*= 3, 4, 5

- Balmer also proposed more series for hydrogen with frequencies given by the general expression:

- where
*n*>_{1}*n*_{2}*n*= 1 = Lyman Series_{2}*n*= 2 = Balmer Series_{2}*n*= 3 = Paschen Series_{2}*n*= 4 = Bracket Series_{2}*n*= 5 = Pfund Series_{2}

**See also: **Brackett Series, Lyman Series, Paschen Series, Pfund Series.