Quantities derived from radiation scattering

The measurement of the intensity I(q) scattered by a polymer solution, gives us almost directly the structure function 

The basic quantities M,Rq and A2 characterize the structure function H(q). Let us examine the manner in which these quantities are derived from experimental results. We write 

1 A study of the scattered intensity close to the zero angle the Zimin representation 

From measurements of the scattered intensity close to the zero angle and in the limit of zero concentration, we get certain averages of the basic quantities M,Rq, and A2. Let us indeed recall the results (7.3.2) and (7.3.3) 

The experimental determination of this quantity is therefore independent of the determination of the constant K. 

---

The Raman spectrum can be used to give additional information regarding the symmetry properties of vibrations. This information derives from the measurement of the depolarization ratio p for each Raman band. The quantity p is a measure of the degree to which the polarization properties of the incident radiation may be changed after scattering... 

When the electric field strength of the incident light is ED, the induced dipole will be m, = aE0 where a is the optical polarisability. The electric field strength of radiation scattered by the induced dipole Es, depends on second derivative of m1 with respect to time. The useful experimental quantities are intensities of scattered light (Is) and incident important light (is). These are respectively proportional to Es2 and E02, averaged over a vibrational period, i.e., from time t = 0 to 10/C, where 1 is wavelength of... 

Optical biosensors typically consist of an optical fiber which is coated with the indicator chemistry for the material of interest at the distal tip (Fig. 22). The quantity or concentration is derived from the intensity of absorbed, reflected, scattered, or re-emitted electromagnetic radiation (e.g. fluorescence, bio- and chemiluminescence). Usually, enzymatic reactions are exploited, e.g. [463]. 

---