Abstract
FROM my observations on the emission of light by canal rays (Ann. d. Phys., 21, 401, 1906; Physik. Zeitschr., 7, 355, 1906), I have concluded that absorption of light in a band spectrum (running towards the red) produces fluorescence. Hartley and others have stated that benzene has a banded absorption spectrum in the ultra-violet; adopting that principle, I conjectured that benzene had an ultraviolet fluorescence. I have confirmed this by the following method:—The ultra-violet rays from a mercury lamp by W. C. Heraeus (Hanau, Germany) fell vertically upon a diluted solution (0.25 per cent.) of benzene in alcohol, and the fluorescence light emitted by it horizontally was analysed by a quartz spectrograph. In the spectrograms obtained there appeared, besides the mercury lines, a group of four strong continuous bands situated in the ultra-violet between λλ 271 and 314 µµ; these bands run towards the red end of the spectrum, and the heads have the wavelengths 272, 280, 283, 292 µµ.
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