Knowledge Bank

Plolarization of coherent scatter and Raman bands from solvents and of electronic emission from a varicty of complex molecules has been measured in the visible and near U-V using two crossed Ebert monochromators equipped with Glan prisms. The Rayleigh deplorization factors were also measured using a light-scattering photometer designed for measurement of extremely low depolarization factors. When the observed Raman bands corresponded to totally symmetric vibrations, they were highly polarized, as expected. Polarization of the fluorescence of some Xanthydrol derivatives in glycerol at $296\circ K$ was found to vary from -0.2 to + 0.44 with excitation in the range of 300 to 550 millimicrons. This work was performed as part of the activities of the Task Group on Reagent Specifications and Standard Methods of Analysis, ASTM (E-13) Subcommittee on Molecular Emission. A brief review will be given of assignments for this group, results obtained and proposed plan of action.