| Popis: |
A theory of three-photon (hyper-Raman and hyper-Rayleigh) scattering is proposed using the approach of irreducible Cartesian and spherical tensors. A general expression for the intensity-time correlation function of symmetric, non-symmetric and symmetric-non-symmetric three-photon scattering is derived in terms of separated, irreducible field-and molecular-rotational invariants. The occurrence of the various types of scattering is dependent on the physical conditions, i.e. on the molecular symmetry and the ratio of the light frequency and molecular frequency. The (general) number of five irreducible molecular-rotation and field invariants can undergo a reduction under appropriately chosen experimental and model conditions. The expressions for the intensity function hold for arbitrary (e.g. elliptical) states of light Polarization and angulardistributions. In particular, they are applied to linear and circular polarization. On their basis, equations are derived for the depolarization ratio and reversal coefficient of hyper-Raman and hyper-Rayleigh scattering. |
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