## Intensities of spectral lines: On the application of the quantum theory to the problem of the relative intensities of the components of the fine structure and of the Stark effect of the lines of the hydrogen spectrum |

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a-priori probability angular momentum appear Balmer series Bohr Bohr's calculations characterised circular orbit coefficients columns contain components corresponding consideration considered constant coordinates denoted direction discussion easily seen electric force electron round equal to zero equations estimate expected expression field of force formulae function fundamental frequencies give rise given harmonic vibrations helium lines homogeneous electric field hydrogen lines influence initial integral logarithmic mean magnetic field major axis mean value mechanical mentioned motion negative entire values nents observed obtained order of magnitude ordinary electrodynamics original components parallel components Paschen Perp perpendicular component perturbed system plane polarised parallel polarised perpendicular possible quantum theory relative amplitudes relative intensities relativity modifications represented rotation round the nucleus separation of variables small quantities proportional spectral lines spectrogram spectrum Stark effect stationary structure components symmetrical tables theoretical tion total energy transitions trigonometric series undisplaced vacuum tube vibrations of frequencies Volt/cM z-axis Zeeman effect