Preferred Label : Rayleigh ratio;
IUPAC definition : The quantity used to characterize the scattered intensity at the scattering angle
θ, defined as R(θ) iθr2/IfV, where I is the intensity of the incident radiation,
iθ is the total intensity of scattered radiation observed at an angle θ and a distance
r from the point of scattering and V is the scattering volume. The factor f takes
account of polarization phenomena. It depends on the type of radiation employed.
ol li For light scattering, dependent on the polarization of the incident beam,
f 1 for vertically polarized light, f 1 - cos 2 θ for horizontally polarized light
and f (1 cos 2 θ)/2 for unpolarized light. /li li For small-angle neutron
scattering, f 1. /li li For small-angle X-ray scattering, f 1, if θ ca.
5 . /li /ol ;
Scope note : an alternative recommended symbol is r¿.; in small-angle neutron scattering the term cross-section is often used instead of
r¿;the two quantities are identical.; the dimension of r¿ is length-1.;
Origin ID : R05159;
See also
The quantity used to characterize the scattered intensity at the scattering angle
θ, defined as R(θ) iθr2/IfV, where I is the intensity of the incident radiation,
iθ is the total intensity of scattered radiation observed at an angle θ and a distance
r from the point of scattering and V is the scattering volume. The factor f takes
account of polarization phenomena. It depends on the type of radiation employed.
ol li For light scattering, dependent on the polarization of the incident beam,
f 1 for vertically polarized light, f 1 - cos 2 θ for horizontally polarized light
and f (1 cos 2 θ)/2 for unpolarized light. /li li For small-angle neutron
scattering, f 1. /li li For small-angle X-ray scattering, f 1, if θ ca.
5 . /li /ol
