Hyper-Rayleigh Scattering HRS

An important goal of this study is to characterize the noncentrosymmetric arrangement of the azobenzene branches in dendrimers and the effect of these dendrimers on macroscopic second-order susceptibihty. The NLO activity of the dendrimers can be characterized by their molecular hyperpolarizabihty. The hyper-Rayleigh scattering (HRS) method is a reliable way of measuring the mol-... 

Abstract Second-order nonlinear light scattering, or hyper-Rayleigh scattering (HRS)... 

Aminovinylnitrothiophenes 84, a novel type of push-pull chromophores, were closely investigated with respect to their NLO and thermal properties [82]. Hyper-Rayleigh scattering (HRS) measurements at a fundamental of 1500 nm re-... 

The important question in EFISHG, especially in the light of the complementarity with hyper-Rayleigh scattering (HRS), is What is actually experimentally determined The expression for the rotational contribution is determined by the scalar product of the dipole moment vector with the vector part of the third-rank hyperpolarizability tensor (Eq. (13)). 

A second experimental method, Hyper-Rayleigh Scattering (HRS), allows (3 measurements for nondipolar and/or ionic molecules, which cannot be measured with the standard EFISH, The intensity of the scattered light is proportional to the square of the incident intensity and can be written as... 

Experimental Hyperpolarizabilities for Gas and Liquid. The usual sources of hyperpolarizability data are EFISH (Electric Field Induced Second Harmonic), the static and optical Kerr effect (KE and OKE) and hyper-Rayleigh scattering (HRS). The extraction of molecular hyperpolarizabilities from the EFISH signal requires careful analysis of the second harmonic output signal... 

The lack of a permanent dipole moment in the cryptand-based molecules makes the classical electric field-induced second harmonic generation (EFISH) experiment (154) unsuitable for the determination of molecular nonlinearity p which, however, can be obtained in solution employing the hyper-Rayleigh scattering (HRS) technique (155). The powder SHG measurements were carried... 

Experimentally, mainly two techniques - the electric field induced second harmonic generation (EFISH) and hyper-Rayleigh scattering (HRS, also termed harmonic light scattering method) - are used in order to determine in solution the experimental value of the quadratic hyperpolarizability of molecular NLO chromophores. 

FIGURE 6.5 A schematic representation of a femtosecond, wavelength-agile (700-2000 nm) hyper-Rayleigh scattering (HRS) apparatus capable of absolute (integrating sphere) j3 measurements is shown. 

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