Raman scattering

Porto's notation

It is a way to indicate the configuration of the Raman scattering experiment. This notation expresses the orientation of the crystal with respect to the polarization of the laser in both the exicitation and analysing directions. The notation of Porto, for Raman scattering processes, consists of four letters:

A(BC)D

A ≡ The direction of the propagation of the incident light (k_i).

B ≡ The direction of the polarization of the incident light (E_i).

C ≡ The direction of the polarization of the scattered light (E_s).

D ≡ The direction of the propagation of the scattered light (k_s).

Example: Y(XZ)X

In this case we have that the direction of the propagation of the incident light is along the Y direction while the direction of the scattered light is along the X direction.
The direction of the polarization of the incident light is along the X direction while the direction of the polarization of the scattered light is along the Z direction.

Back scattering geometry

One of the possible configurations which can be carried out in a Raman scattering experiment is the back scattering geometry. In this geometry, the direction of the propagation of the incident and scattered light is the same but their senses are opposite. On the other hand, the propagation and polarization of the incident and scattered light must be ortogonal.

k_i = -k_s

k_i ⊥ E_i and k_s ⊥ E_s

Examples of back scattering geometry:

-X(YY)X
-Z(XX)X
-X(YZ)X
...

Right angle scattering geometry

Right angle scattering geometry is another possible configuration for Raman scattering experiments. In this geometry, the propagation and polarization of the incident and scattered light must be ortogonal.

k_i ⊥ E_i

k_s ⊥ E_sExamples of right angle scattering geometry:

Y(XY)X
Z(XX)Y
X(YZ)Y
...

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