Fluorescence of Mercury Vapour under Low Excitation


IN earlier letters to NATURE (Aug. 18 and Nov. 10, 1928), I have described mercury fluorescence with exciting wave-length as long as λ3125. Since then even longer waves have been used. The source was a nickel arc, with a filter of natural (ortho) salicylic acid, which cuts off completely all waves shorter than 3360. The mercury vapour was at high density. The spectrum observed consists of the two well-known broad continuous maxima, one in the visual region (green fluorescence), and the other in the ultra-violet, from about 3130 to 3650. The latter has never, so to speak, been dissected. If it has appeared at all in any spectrum it has appeared complete, and it has never shown any signs of resolution into a fine structure.

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RAYLEIGH Fluorescence of Mercury Vapour under Low Excitation. Nature 123, 127 (1929). https://doi.org/10.1038/123127a0

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