Benzene resonance Raman

Resonance Raman scattering, 21 326-327 Resonance stabilization of benzene, 3 599 Resonance theory, 20 774 Resonant cavity, 14 851 Resonant-cavity enhanced structures,... 

RESONANCE RAMAN SPECTROSCOPY Ferredoxin-dependent enzymes, ADRENODOXIN BENZENE 1,2-DIOXYGENASE FERREDOXIN NADP REDUCTASE GLUTAMATE SYNTHASE HYDROGENASE... 

Figure 9. Resonance Raman spectrum of (L-AyMoOfbdt) in benzene using 514.5-nm excitation. The unmarked bands are those of the solvent. [Adapted from (23).]...

The effect of oxygen on cyclic 1,3-diradicals shows that conformation can affect the triplet state lifetime ST Time resolved resonance Raman spectroscopy has been used to examine triplet states produced from different isomers of p-carotene. A theoretical study has also been reported on the a-cleavage of the triplet states of symmetric and non-symmetric ketones S mechanism for triplet state relaxation of aromatic molecules has been used to explain experimental data for substituted benzenes. The decay kinetics of triplet-triplet fluorescence in the mesitylene biradical (two sub-levels) have been measured between 10 and 77K in Shpolski matrices triplet state of dimesityl... 

The Raman spectra of DWCNT s were analysed in terms of chiral, (n,m) assignments for these tubes.266 The Raman spectrum of I2-doped DWCNT gave assignments to radial breathing and tangential modes.267 Resonance Raman spectra of DWCNT were analysed to probe diameters and chiralities.268 The Raman spectra of DWCNT (from fullerene peapods annealed at high temperatures) show that the inner tubes are remarkably defect-free.269 Very low levels of defects were also observed from the Raman spectra of DWCNT produced by the catalytic decomposition of benzene over Fe-Mo/ A1203 catalysts at 900°C (i.e. very weak D-band at 1265.5 cm-1).270... 

Scattering Phenomena.—A review has appeared of the scattering of depolarized light by simple fluids.437 Pre-resonance Raman spectra of NH3, CH8NH2, form-amide, cw-dichloroethylene, propargyl alcohol, and pyrazine 438 resonance Raman scatter of I2 in solution and in inert matrices 439 time-resolved resonance fluorescence and resonance Raman 440 and stimulated resonance Raman scattering 441 pseudo-Raman spectra in stacked benzene molecules 442 and birefringence in CS2 443 have been the subjects of recent reports. 

Fig. 11. Resonance Raman spectra of the dimethylester of unlabelled Ni(PP) (top) and its deuter-ated isotopomers. The label positions are specified at the right side of each spectrum left) the 514.5-nm excitation spectra for the CH2CI2 solution, right) the 406.7-nm excitation spectra for the benzene solution (the inserted spectra were observed for the CCI4 solution) (from Ref. 56)...

Time-resolved resonance Raman spectroscopy data for NiOEP in benzene [51]. 

The simplest aromatic molecule, benzene, is characterized by a lowest absorption band that is located relatively far in the ultraviolet (37,800 cm ) and is dipole forbidden ( B2 in Dg/,). The same applies to the second absorption band ( Bi at 46,500 cm ). The lowest-energy allowed transition ( Ei ) is located at about 52,700 cmAll these transitions are well outside the range where their resonance Raman spectra can be studied in detail by present-day techniques. However, some preresonance data are available (Ziegler and Albrecht, 1977 Ohta and Ito, 1977b Ito et al., 1978), which allow a partial analysis of vibronic coupling channels in benzene. 

The benzene preresonance Raman spectra show also fairly strong activity of the first overtone of mode Vi4(b2 ). This mode is dipole forbidden and thus cannot directly obtain its intensity through coupling of B2 with the ground state as discussed in Section IX,D. However, it is possible to formulate several higher-order vibronic coupling schemes that yield such overtone activity, depending on which state is the resonant state. The Raman intensity probably derives from the dipole allowed 2 transition... 

ABSTRACT Resonance Raman spectroscopy has been demonstrated to give important structural information on the reactions of aromatic molecules in the interlayer of transition-metal ion-exchanged montmorillonites. Para-substituted benzenes or 4,4 -substituted biphenyls are oxidized to form their cation radicals, which are stabilized in the interlayer of the clay mineral. The oxidative dimerization or polymerization results in the formation of biphenyl type cations and poly-p-phenylene cations from mono-substituted benzenes and benzene, respectively. 

In order to understand the structure and the nature of these colored compounds, largely benzene derivatives, we investigated the adsorption of these aromatic molecules on transition-metal, Cu(II), Fe(III), Ru(III) ion-exchanged montmorillonites using resonance Raman... 

The crystal violet used as a sample has an absorption band around 250 nm, originating from benzene rings in the molecular structure. The wavelength of 244 nm used for Raman excitation nearly matches the DUV absorption of crystal violet, allowing the resonance Raman spectrum to be measured. They observed a change in the resonance Raman spectral shape when the molecules were placed on aluminum, which they attributed to a manifestation of the surface enhancement effect of aluminum. 

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