Raman diffusion

The out-of-plane vibrations of thiazole correspond to C-type vibration-rotation bands and the in-plane vibrations to A, B, or (A + B) hybrid-type bands (Fig, 1-9). The Raman diffusion lines of weak intensity were assigned to A"-type oscillations and the more intense and polarized lines to A vibration modes (Fig. I-IO and Table 1-23). 

HnZSM-5 were obtained by calcination procedure under 02 at 673 K during 24 h of NH4+-exchanged zeolites from VAW aluminium (Schwandorf, Germany) and from Zeolyst International (Valley Forge, USA). The chemical analysis, powder XRD patterns, 29Si, 27A1 MAS-NMR, IR, Raman, Diffuse reflectance UV-visible (DRUVv)... 

Although this method is as old as infrared absorption spectroscopy, Raman diffusion has been plagued by its lack of sensitivity. This situation has recently changed with the advent of laser excitation sources and Fourier transform computations. However, the cost of Raman instruments is still relatively high. This method, which can have advantages over absorption spectroscopy, is not yet widely used. 

Figure 10.24—Raman diffusion. Origin of emission bands cell geometry Raman spectrum of L-cystine.

Calculate the position of the radiation of Raman diffusion for a monochromator of excitation regulated to 400 nm the solvent used is cyclohexane. (Recall that for cyclohexane, the Raman diffusion corresponds to a radiation displaced by 2 880 cm 1 with respect to the wavelength of excitation.)... 

A test for the sensitivity of a fluorimeter is to measure the intensity of fluorescence of the Raman diffusion peak of a cell filled with water and with an optical pathlength of 1 cm. If the wavelength of excitation is regulated to 250 nm, at which wavelength must the measurement be made (the Raman displacement of water is 3 380 cm-1) ... 

For quantitative analysis, how can one avoid confusing the Raman diffusion and the fluorescence of the compound ... 

Radioactive label, 330 Raman diffusion, 184 Raman scattering, 227 Ratio fluorimeter, 228 Rayleigh scattering, 226 Real mean, 385 Red-shift, 196 Reference electrode, 347 Reflectron, 298 Refractive index detector, 59 Relative response factor, 78 Relative standard deviation, 387 Reliability, 389 Resolving power, 282 Response factor, 77 Restrictor, 98 Retardation factor, 88 Retention factor, 14 Retention index, 41 Retention time, 7 Retention volume, 14 RP-18, 53 RSD, 387 Ruhemann, 112... 

Four different aryldiazonium salts have been used to functionalize SWCNTs through electrochemical reduction. By XPS and Raman diffusion measurements, the growth of aryl chains on the sidewalls of the nanotubes was observed [178]. Electrically addressable biomolecular functionalization of SWCNT electrodes and vertically aligned carbon nanofiber electrodes with DNA was achieved by elec-trochemically addressing (reduction) of nitrophenyl substituted nanotubes and nanofibers. Subsequently, the resulting amino functions were covalently linked to DNA forming an array of DNA-CNT hybrid nanostructures (Scheme 1.28) [179],... 

To close this section, it should be noted that the NMR spectra of phosphacyman-trene oriented in nematic phases have been investigated ) and that an order-disorder phase transition at 110 K has been put in evidence for the same molecule by calorimetry. X-ray diffraction, and Raman diffusion ). 

There is some strong interactions between noble metals and cerium proved by spectroscopy like Raman diffusion [82], photoluminescence and diffuse reflection [83], FTIR of probe molecules [84]. Interaction may form species like M-O Ce where both M and Ce are in oxidised states. 

During the past decade, the main advances in the spectroscopic characterization of silica powders have come from 29Si NMR, Raman diffusion, and Fourier transform infrared (FTTR) studies. NMR studies have given two types of results. First, single and geminal silanols have been quantitatively differentiated as a function of dehydroxylation by thermal treatment and subsequent rehydroxylation by liquid water (7). The fraction of geminal silanols... 

Raman diffusion is observed at a wavelength that is higher than the excitation wavelength. The diffused photons have quantum energy inferior to that of the excitation photons. Therefore, the intensity of the Raman peak is lower than that of the Rayleigh peak. Raman can perturb the emission spectrum and thus one should subtract the Raman from the emission spectrum. 

INFRARED ABSORPTION SPECTRA AND RAMAN DIFFUSION OF SOLID THIETANE. 

Furthermore, some studies have been carried out by a Raman diffusion process on PPP and (CH) samples. Note that with this spectroscopy nearly the entire implanted layer s thickness can be analyzed. 

---