A resonance Raman spectrum

IVCT). The second e value corresponds to the abundance of 28 Mo centers (see Ref. 5). Using an excitation line within the contour of the 1070-nm band gives rise to a resonance-Raman spectrum showing hve bands in the region between 900 and 200 cm very characteristic for all molybdenum blue species [802 (s), 535 (m), 462 (s), 326 (s), 215 (s) cm ]. 

The metal coordination environment for HPP dioxygenase appears to be an exception to the 2-His-l-Asp active site discussed. This enzyme is isolated in the high-spin Fe(III) state as indicated by an intense EPR signal at g = 4.3. More significantly, it is deep blue in color (A,max 595 nm) and exhibits a resonance Raman spectrum characteristic of a tyrosinate ligand [219], Indeed, sequence comparisons of seven HPP dioxygenases from various mammalian and pseudomonad sources indicate the presence of a conserved Tyr residue [220,221], It... 

Interpretable Laser Raman and Laser mass spectra have been obtained from certain other microstructures ( Ramsaysphaera ) (Fig. 32). The Laser mass spectra are characterized by CN and CNO ions (Fig. 33). Raman lines (Fig. 32) appear at 1360, 1600, 2720, 2960 cm-1 within the organic range of the spectrum. The strong line at 1360 cm-1 may be atrributed to a symmetric N—O vibration of the N02 group, the weaker line at 1600 cm-1 is characteristic of aromatic double bonds C = C. The first overtone of the 1360 cm-1 line is observed at 2720 cm-1. The spectrum has the features of a resonant Raman spectrum. It is very often obtained with this type of product in which a large delocalisation of electrons is possible. 

A. Resonance Raman Spectrum. A normal (nonresonance) Raman spectrum of a sample results from an inelastic scattering of an incident light source (e.g., a laser) at frequency vq, where... 

Highest harmonic of vj detected in a resonance Raman spectrum of the complex specified. Two-probe, single-crystal data. ... 

Raman spectrum of I2 is observed. A solution of the Br2 cation also gives a resonance Raman spectrum with a fundamental of 360 cm and strong overtones 14). Edwards and Jones (17) reported that solid Br2" Sb3Pie has a Raman band at 368 cm which they attributed to the Brg cation. Table I shows the stretching frequencies, absorption maxima, and bond lengths of the halogens and the diatomic halogen... 

The theoretical background which will be needed to calculate the excited state distortions from electronic and Raman spectra is discussed in this section. We will use the time-dependent theory because it provides both a powerful quantitative calculational method and an intuitive physical picture [42,46-50]. The method shows in a simple way the inter-relationship between Raman and electronic spectroscopy. It demonstrates that the intensity of a peak in a resonance Raman spectrum provides detailed information about the displacement of the excited state potential surface along the normal mode giving rise to the peak [42,48]. It can also be used to calculate distortions from the intensities of vibronic peaks in electronic spectra [49]. For harmonic oscillators, the time-dependent theory is mathematically equivalent to the familiar Franck-Condon calculation [48]. 

When a long overtone progression is observed for a totally symmetric mode in a resonance Raman spectrum, it is not uncommon to see secondary progressions in the frequency of this mode, based upon one quantum of another totally symmetric mode. The members of the secondary progression may be designated by Vx where... 

The vibration frequency in solid Br SbaFxe was observed ) at 368 cm pected, slightly higher than in solution at 360 cm A resonance Raman spectrum was observed in solution with the overtones at 716,1070,1430,1780 and 2130 cm 17,72) intensity of the fundamental of Br2 at 360 cm was compared to the intensity of a solvent peak at 400 cm. It was noticed that varying the exciting lines changed the relative intensity of the Br2 fundamental. This indicates that the observed spectrum is indeed a resonance Raman spectrum. It was foimd that this intensity decreases in the following order ... 

From these spectroscopic features it is apparent that compound 2 is a good model for the diiron/tyrosyl radical center in R2. The incorporation of a ( i-oxo)diiron(in) core and nearby phenoxyl radical into a single, stable compound affords a resonance Raman spectrum that closely resembles that of the protein. This comparison can clearly be seen in Figure 7. 

The vibrational structure of a resonance Raman spectrum is thus similar to that of a (hot-band) emission spectrum. This relationship between Raman spectra and their REPs is equivalent to the mirror-image relationship observed between absorption and emission spectra in simple cases (Mingardi et ai, 1975). 

Energy-level diagram illustrating the formation of a progression of Stokes lines in a resonance Raman spectrum. 

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