ACCORDING to Schrödinger's theory, the intensity of an expectral line in emission is not determined by the number of atoms in the higher level and the coefficient of expontaneous emission, but by the populations of both the higher and the lower levels corresponding to that line. If we have then two lines emitted by the same higher level, their relative intensity ought to change if we change the relative population of the lower levels, and furthermore, the change in the relative intensity of the lines should be equal to the change of the relative populations.
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GAVIOLA, E. An Experimental Test of Schrödinger's Theory. Nature 122, 772 (1928). https://doi.org/10.1038/122772a0