Rayleigh scattering ratio excess

R( The excess Rayleigh scattering factor defined as the Rayleigh ratio of the solution or single particle event from which is subtracted the Rayleigh ratio of the carrier fluid along with any other background contribntions. 

Note Several modifications of the Zimm plot are in frequent use the most common one uses the excess scattering instead of the excess Rayleigh ratio. 

Static Light Scattering. For a solution of polydisperse nonabsorbing particles, the Rayleigh ratio Rvv(9) is the excess absolute scattered intensity of the solution over that of the pure... 

Conventionally, the excess light scattered per unit volume at angle 6 from the transmitted beam, e, is reported as a Rayleigh factor (or ratio). 

A continuous analog output is provided from the 90° sensor and all the sensors are sampled every 2 sec. The molecular weight range extends from 10 to 10 Daltons and the rms radii from 10 to 50 nm. The total cell volume appears to be about 3 pi and the scattering volume is 0.02 p t. The detector has a sensitivity, defined in terms of the minimum detectable excess Rayleigh ratio of 5 x 10 cm which is difficult to translate into normal concentration units but appears to be equivalent to a minimum detectable concentration of about 10 g/ml. 

When light passes through an inhomogeneous medium such as a polymer solution, it is scattered in all directions. The light scattering at an angle 6 by the solute is measured by the excess Rayleigh ratio Re which is defined by... 

Here the prime denotes the excess scattering from the liquid due to the solute n and rio are the refractive indices of the solution and solvent, respectively dn/dc is the specific refractive index increment with concentration c is the concentration of solute in mass per unit volume II is the osmotic jmessure of the solution, and the other terms are as described previously. Jig, commonly known as the excess Rayleigh ratio, is the difference between the Rayleigh ratios of the solution and the pure solvent ... 

Figure 3,21 Results from (a) dynamic light scattering DJD vs. volume fraction of droplets), and (b) static light scattering (excess Rayleigh ratio vs. volume fraction of droplets) measurements at the emulsification...

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