Thermal Rotations of Fluorescent Molecules and Duration of Luminescence

Abstract

IMPROVED fluorometer measurements, to be published elsewhere in detail, of the duration of luminescence of dye molecules yielded an unexpected result, in that for fluoresceine in water or ethyl alcohol solution was found to be apparently greater than that in glycerine solution. This is contrary to theoretical expectations, according to which should be approximately proportional to the fluorescence efficiency, and it is known that this is rather greater for glycerin than for water solutions.