Luminescence Spectra Excited by the Hydrogen Flames.—Calcium oxide and the Lenard and Klatt phosphorescent sulphides Nos. 3 and 13 were studied by the aid of a spectrophotometer. The broad-banded spectra were found to consist of the same components, individually overlapping and forming overlapping series of constant frequency intervals. Series and individual components were identified with those entering into the spectral structure of these substances when excited to fluorescence by light, but the relative intensities of the bands were found to differ with the mode of excitation.

DOI:https://doi.org/10.1103/PhysRev.17.469