For under certain conditions the chemical atoms emit light waves of a specific length or oscillation frequency - their familiar characteristic spectra - and these can come in the form of electromagnetic waves only from accelerated electric quanta.
Johannes StarkAn external electric field, meeting it and passing through it, affects the negative as much as the positive quanta of the atom, and pushes the former to one side, and the latter in the other direction.
Johannes StarkThe question of the composition of perceptible objects is one which already occupied the mind of the ancient Greeks.
Johannes StarkThe emitters of the spectral series are without exception single atoms, not compounds of atoms.
Johannes Stark