Light scattering unit

Association Structures. The onset of micellization was observed using light-scattering data and confirmed by electron microscopy of carbon replicas from freeze fracturing of samples frozen to — 150°C. The light-scattering unit was a Sophica Photo Gonia Diffusometer, Model... 

Convenient light-scattering units are shown in Table 3.7. 

Figure 6 A close-up view showing main parts of the apparatus a, transducer b, a cone-plate fixture (or a parallel plate fixture) c, temperature enclosure (the two parts labeled (c) come close to each other and are connected into one when it is actually used) d, a part of the light-scattering unit e, objective lens t, focusing microscope body g, CCD camera. From Matsuzaka, K. Hashimoto, T. Rev. Sci. Instrum. 1999, 70, 2387.23...

Strauss and Williamst have studied coil dimensions of derivatives of poly(4-vinylpyridine) by light-scattering and viscosity measurements. The derivatives studied were poly(pyridinium) ions quaternized y% with n-dodecyl groups and (1 - y)% with ethyl groups. Experimental coil dimensions extrapolated to 0 conditions and expressed relative to the length of a freely rotating repeat unit are presented here for the molecules in two different environments ... 

Figure 10.1 Relationships between Iq, Ij, and The light scattered per unit volume i is also shown.

Figure 10.8 Light-scattering data plotted to give slope-intercept values which can be interpreted in terms of M and B. (a) Polystyrene in methyl ethyl ketone. [From B. A. Brice, M. Halwer, and R. Speiser,/. Opt. Soc. Am. 40 768 (1950), used with permission.] (b) Polystyrene in cyclohexane at temperatures indicated. Units of ordinates are given in Example 10.4. [Reprinted with permission from W. R. Krigbaum and D. K. Carpenter,7. Phys. Chem. 59 1166 (1955), copyright 1955 by the American Chemical Society.]...

Even when we discuss the electric field of light without reference to any particular charge, we must be aware of these differences. When that field interacts with a charge, as in light scattering, we will be in trouble unless a self-consistent set of units has been employed. 

Extinction Coefficient a measure of the ability of particles or gases to absorb and scatter photons from a beam of light a number that is proportional to the number of photons removed from the sight path per unit length. See absorption. Extinction Cross Section the amount of light scattered and absorbed by a particle divided by its physical cross section. 

Scattering Coefficient measure of the ability of particles to scatter light measured in number proportional to the "amount" of light scattered per unit distance. 

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