Reference : Sur la limite de visibilité de la fluorescence et sur la limite supérieure du poids abso...
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Physical, chemical, mathematical & earth Sciences : Chemistry
Sur la limite de visibilité de la fluorescence et sur la limite supérieure du poids absolu des atomes d'hydrogène
[en] Limits of Visibility of Fluorescence and the Maximum Value of the Absolute Weight of the Atom of Hydrogen
Spring, Walthère [Université de Liège - ULg]
Bulletin de la Classe des Sciences. Académie Royale de Belgique
Académie Royale de Belgique
[en] Atomic weight ; Hydrogen ; Fluorescence
[fr] Masse atomique ; Hydrogène ; Fluorescence
[en] Spring, W. Bulletin de la Classe des Sciences, Academie Royale de Belgique (1905), 201-11; SciFinder (Chemical Abstracts Service: Columbus, OH); (accessed July 8, 2010).

A solution of fluorescein in optically pure water was subjected to the action of a powerful beam of electric light, and the limit of dilution was observed at which a visible green fluorescence was produced. Assuming under these conditions that one cubic millimetre of the solution contained one molecule of fluorescein (C20H10O5K2 = 408), the value 2.5 × 10-21 grams is obtained for the superior limit of the weight of the atom of hydrogen, which is one-twenty-thousand-millionth part of the value 5 × 10-11 calculated by Annaheim (this Journal, 1877, i, 31), but is about seven thousand times as great as the value 3.45 × 10-25 calculated from the kinetic theory of gases.

Reprinted with the permission of the American Chemical Society. Copyright © 2010. American Chemical Society (ACS). All Rights Reserved
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