Partial Quantum Mechanical Treatment of the Raman Effect

Partial Quantum Mechanical Treatment of the Raman Effect 

At the beginning of the twentieth century a general understanding of the origins of molecular spectra was achieved with the advent of the quantum theory. According to the basic principle of quantum mechanics, the energy associated 

The molecular energy gain or loss, AE, corresponds to the energy of the absorbed or emitted radiation which is, in turn, directly proportional to the radiation frequency or wavenumber  

A given normal vibration exhibits spectral activity if the electric dipole moment p of the molecule changes during this vibration, i.e. when the value of the dipole moment derivative, taken at equilibrium, differs from zero  

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