Abstract
A beam from a mercury arc is passed through a vessel filled with mercury vapor of 16.2\ifmmode^\circ\else\textdegree\fi{}C, and excites in it resonance radiation of wave-length 2536. The absorption coefficient and the scattering coefficient of this radiation have been measured. It was found: (a) the absorption coefficient is 1 ${\mathrm{cm}}^{\ensuremath{-}1}$ and is not changed measureably by the admission of air up to 4 mm pressure, although the resonance radiation is strongly quenched by the air; (b) in vacuum the scattering coefficient is equal to the absorption coefficient within the limits of the experimental error. This proves the assumption first made by Wood that in vacuum there is no true absorption, but that the whole loss of energy is due to scattering. For higher pressures, the scattering coefficient diminishes. The data found are in good agreement with previous direct measurements of Wood and Stuart.
Published Version
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