The Photoluminescence of Flames. II

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Abstract
Photoluminescence of salted flames.—Study of a new flat hydrogen flame showed that the sensitiveness to excitation noted in previous work, is confined chiefly to the boundary between the oxidizing and reducing regions. When excited by exposure to light from an amalgam arc, measurements of the positions of the edges of the bands and of the intensities of the maxima and minima showed that the effect of excitation was to decrease the width of the bands and to increase the sharpness and the intensity of the maxima, for flames salted with Ba, Ca and Sr. In the case of Tl, the green line was increased in brightness more than 50 times. This effect was traced in the presence of Tl in the arc, and by dispersing the light so as to use only narrow spectral regions, it was found that the Th lines 5351, 3776 and 3519 A excite the flame, whereas neighboring mercury lines are inactive. The luminescence is thus shown to be selective and to be closely analogous to the so-called resonance radiation of vapors.

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