.
N=1. Hydrogen.
In [Part I.] we have considered the binding of an electron by a positive nucleus of charge
, and have shown that it is possible to account for the Balmer spectrum of hydrogen on the assumption of the existence of a series of stationary states in which the angular momentum of the electron round the nucleus is equal to entire multiples of the value
, where
is Planck’s constant. The formula found for the frequencies of the spectrum was