On the quantum theory of radiation and the structure of the atom

THE LONDON, EDINBURGH, AND DUBLIN
PHILOSOPHICAL MAGAZINE AND JOURNAL OF SCIENCE.
VOL. XXX—SIXTH SERIES.
JULY-DECEMBER 1915.
According to the theory proposed by Sir Ernest Rutherford, in order to account for the phenomena of scattering of
A. An atomic system possesses a number of states in which no emission of energy radiation takes place, even if the particles are in motion relative to each other, and such an emission is to be expected on ordinary electrodynamics. The states are denoted as the “stationary” states of the system under consideration.
B. Any emission or absorption of energy radiation will correspond to the transition between two stationary states. The radiation emitted during such a transition is homogeneous and the frequency
is determined by the relation
where
is Planck’s constant and
, and
, are the energies of the system in the two stationary states.