Abstract
IN a recent paper on the optical excitation of mercury vapour (Phil. Mag., Sept. 1927) I directed attention to the fact that lines excited by two successive processes of absorption should increase with the square of the intensity of the exciting light, while lines resulting from a three-stage absorption should increase with the cube of this intensity.
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WOOD, R. Variation of Intensity Ratios of Optically Excited Spectrum Lines with the Intensity of the Exciting Light. Nature 120, 725 (1927). https://doi.org/10.1038/120725a0
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DOI: https://doi.org/10.1038/120725a0
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