Bohr model without quantum jumps
  Omission of Bohr's second postulate permits a derivation of spectral intensity. The transition amplitudes serve as upper bounds to quantum mechanical matrix elements. They also provide insight into the latter in terms of Sommerfeld ellipses and transition trajectories. The speed of a nascent photon in the region of the electron transiton is addressed and the orbit concept is reinterpreted. 
Manfred Bucher