Rayleigh ratio
Oxford Dictionary of Biochemistry:
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Rayleigh ratio
symbol: R; the ratio of the intensity of light scattered by particles (molecules) in solution at an angle θ from the incident beam, Iθ, multiplied by the square of the distance, r, from the particle to the detector, divided by the intensity of the incident light, Io, i.e. R = Iθ r2/Io. The reduced Rayleigh ratio, Rθ = Iθ r2/Io(1 + cos2 θ). Many literature references do not distinguished between these two. Rayleigh scattering. [After John William Strutt, Lord Rayleigh (1842 — 1919), British mathematician and physicist.]
| Rapoport-Lübering shunt, Ran, Ramos | |
| Rayleigh scattering, Rb, RbAp |
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Rayleigh ratio
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The Rayleigh ratio is a quantity used to characterize the scattered intensity as a function of scattering angle 
, and is defined as
where 
is the intensity of the incident radiation, 
is the total intensity of scattered radiation observed at an angle and a distance 
from the point of scattering and 
is the scattering volume. The factor 
is introduced to compensate for polarization phenomena, and is dependent of the type of radiation used as follows:
1. For light scattering, depends on the polarization of the incident beam, and is 
for vertically polarized light, 
for horizontally polarized light and 
for unpolarized light.
2. For small-angle neutron scattering, .
3. For small-angle X-ray scattering, 
, if < ~ 5° .
Notes:
1. The dimension of 
is an inverse length.
2. In small-angle neutron scattering the term cross-section is frequently used in place of .
3. IUPAC also recommends the symbol 
.
References
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Oxford Dictionary of Biochemistry
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