Abstract
THE principle referred to by Prof. Wood in his letter to NATURE of Nov. 19, that the product of a two-stage absorption increases at first as the square of the intensity of the light, that of a three-stage absorption as the cube, and so on, is evidently capable of wide application.
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BAKER, E. Variation of Intensity Ratios of Optically Excited Spectrum Lines with the Intensity of the Exciting Light. Nature 120, 917–918 (1927). https://doi.org/10.1038/120917c0
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DOI: https://doi.org/10.1038/120917c0
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