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absorption bands absorption region absorption spectrum amperes Anthracene approximately Barium uranyl acetate calcium tungstate calibration plot Cesium uranyl chloride Cesium uranyl sulphate comparator reading copper uranyl acetate CORNELL UNIVERSITY curves determine what wave-lengths dispersed DOCTOR OF PHILOSOPHY eosin Excitation band excitation between 550 exciting fluorescence exciting light EXCITING POWER exposure fluorescein fluorescence and absorption fluorescence excited fluorescence spectrum fluorescent light fluorescent material frequency units Fuess spectrograph galvanometer graph greater absorption greater fluorescence homologous bands Lithium uranyl acetate mercury lines Mercury uranyl acetate observed photo-electric cell photographic plate PHYSICAL REVIEW plate-holder Potassium uranyl chloride Potassium uranyl nitrate quartz range reciprocal wave-lengths reversing region Rubidium uranyl nitrate Rubidium uranyl sulphate Sodium copper uranyl Sodium uranyl cobalt spark spectra Strontium uranyl acetate TABLE twelve uranyl compounds type of excitation ultraviolet excitation ultraviolet light ULTRAVIOLET SPECTRUM uranyl salts Values of i/X variable in intensity Zinc silicate Zinc sulphate