Which lines are more intense in raman spectroscopy?
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ANSWER:-
In Raman spectroscopy, only the more intense Stokes line is normally measuredRaman scattering is a relatively weak process. The number of photons Raman scattered is quite small. However, there are several process which can be used to enhance the sensitivity of a Raman measurement.
The Stokes Scattered Radiation Lines
Raman Scattering is itself low intensity scattering. However, the lines produced from the Stokes scattering are much more intense than the anti-Stokes scattering.
This is because Stokes lines occur from the excitation of atoms as a result of incident light being scattered through inelastic scattering. These atoms transition from the ground state to the excited state.
Anti-Stokes lines are formed from the transition from the exited state to the ground state.
The intensity of the stokes lines is proportional to the number of atoms in the ground state while the intensity of the Anti-Stokes lines is proportional to the number of atoms in the excited state.
Since the number of atoms in the fround state is more than in the excited state, the intensity of the Stokes lines is greater than the intensity of the Anti-Stokes lines.