Second order scattering

Fig. 4 Effect of nanoclay loading on neat SEBS a Lorentz -corrected SAXS profiles (vertically shifted for better clarity) showing effect of nanoclay arrows indicate peak positions, b Lengths corresponding to first- and second- order scattering vector positions along with the 2D SAXS patterns for each sample of clay-loaded nanocomposites...

Figure 4. Open circles, angular dependence of the second-order scattered light intensity (hyper-Rayleigh scattering from 1064 to 532 nm) for a suspension of purple membrane patches of bacteriorhodopsin before any solubilization has taken place. Solid curve best fit to the data by combining the nonlinear hyperpolarizability of retinal with the linear refractive index of the upo-protein.

In a quantum-mechanical treatment, Raman scattering is the result of an inelastic collision process between the photon and the elementary excitations of the medium. The photon either loses one or more quanta of vibration energy (Stokes lines) or gains one or more such quanta (anti-Stokes lines). In the first-order scattering, only one photon is involved, while in the second-order scattering, two photons are involved. The mechanism of the first-order Raman scattering is schematically shown in Figure 10.2. 

Q Second-order scattering from the 100 plane is equivalent to first-order scattering from which plane ... 

STUDIES ON DETERMINATION OF DEOXYRIBONUCLEIC ACID BY SECOND ORDER SCATTERING WITH A NOVEL RHODANINE... 

SOS spectrum of different systems. Second order scattering spectrums of different systems were recorded at AeX=310 nm in the wavelength range of 600 nm-640 nm according to the experimental method (Fig. 1). 

Studies on Determination of DNA by Second Order Scattering with a Novel Rhodanine 455... 

DETERMINATION OF BSA BY ITS ENHANCEMENT EFFECT ON SECOND-ORDER SCATTERING OF 3-(4 -METHYL PHENYL)-5-(4 -METHYLr2 -SULFOPHENYLAZO) RHODANINE... 

Determination of BSA by Its Enhancement Effect on Second Order Scattering 467... 

The band intensities of the dysprosium and europium complexes are fairly similar except for the acetylacetonate (acac) adducts. The assignments for the two ion emission bands observed for the dysprosium complexes are F9/2- Hi5/2 at 480 nm and Fq/2- His/2 at 572 nm (21). For many other dysprosium complexes, a band assigned to the F9/2- Hii/2 transition was also reported at approximately 650 nm (5, 16). Second-order scatter radiation from the excitation source which occurs in this region prevented observation of this transition. The europium complexes have only two available resonance levels, Dq and Di (8, 9, 22). For the appropriate assignments for the observed bands, see Table I. The Do- F2... 

Fig. 45. Raman spectra of (100) cleaved intermediate-valence Smi, R,S with R = Y, Pr, Gd and Dy at 300 K. Upper part unpolarized spectra spectra at 80 K for a = 0.22 Gd and x = 0.75 Dy, respectively, prove first- and second-order scattering (dashed line) at 300 K. The gap mode is seen near 200 cm . Lower part polarized Raman spectra of Sm, jgGd at 300 K.

Weber, W.H., Hass, K.C., McBride, J.R. Raman study of Ce02 second-order scattering, lattice dynamics and particle-size effects. Phys. Rev. B 48, 178-185 (1993)... 

RRS) spectra from trans (1,2) and cis (CH)x (3) and (CD)x have shown that the two isomers present different properties for the electronic excited states and their couplings to the vibrational modes responsible of the light scattering. The main differences in the RRS spectra consist of the long progression of overtones in the spectra of the cis (CH) samples while in the trans (CH)x spectra only the first order processes have been observed and carefully analyzed at least with the laser frequencies used so far (1.65 eV 3.7 eV (4). Broad and weak second order scattering... 

Clays and Persoons presented a new technique in 1992 for the determination of the hyperpolarizabilities of nonlinear optical compounds in solution using the hyper-Rayleigh scattering (HRS). The values for first hyperpolarizabilities can be obtained from second-order scattered light intensity. This method has several advantages over the EFISH technique it needs no electric field, and thus the experiment is simplified, the hyperpolarizability P can be directly measured, and the P values for salts can be determined as weU. 

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