Relative scattering power

For standards, see Table 1.1 ( Scattering power, relative ). The relative scattering power S is the ratio of the scattering power Sr of the test white pigment to the scattering power of a white reference pigment Sr [1.55]. It can be determined in two ways  

Black-Ground Method. The relative scattering power is determined from the tristimulus values Y of the pigmented medium applied in various film thicknesses to black substrates. Compared with the gray paste method, the black-ground method has the advantage that it is not restricted to any particular test medium. Apparatus spectrophotometer. 

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Fig. 1.—Radial distribution curves for (A) ethane, (B) propane, (C) isobutane and (D) neopentane. The positions of the heavy arrows indicate the interatomic distances determined by the comparison of the photographs with theoretical intensity curves their heights show the relative scattering power associated with each distance.

Mass spectrometric studies on iron(II) chloride and iron(II) bromide showed that monomers are the major species in the vapor phase, while concentration of the dimer, Fe2X4, increases with temperature in its certain interval. The electron diffraction data on iron(II) chloride could be well approximated by monomers only, while the data on the bromide indicated the presence of a detectable amount of dimeric species. This can be seen on the radial distribution of Fig. 12. It was found that there was about 10% dimeric qjecies present under the experimental conditions (nozzle temperature around 625 °C). As regards the relative scattering power, this constituted about 20%, and allowed only the determination of a limited amount of structural information. The electron diffraction date were consistent with a bridge stmcture characterized by the same Fe-Br, bond length as that of the monomeric... 

Fig. 14. Relative scattering power Q/Qe (O O) and fraction of spherulitic crystallized materials x, ( ) as a function of crystallization time t during isothermal crystallization of PET from the glassy state at 1 lf7 °C...

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