Spectra laser Raman

Stable solutions at temperatures below — 150°C in SbFs—SO2 and FSO3H— SbFs—SO2, where the structure is static and hydride shifts are absent. Studies by H and NMR, as well as by laser Raman spectra and X-ray... 

Absorption (33-55,000 cm" ) spectra and laser Raman spectra, as well as... 

Figure 4.7. FT-Laser Raman spectra of Mo03(3.1)/Ti02 (a), Mo03(6)/Ti02 (b), Mo03(8.7)/Ti02 (c) and Mo03(ll)/TiO (d) catalyst [96].

The first laser Raman spectra were inherently time-resolved (although no dynamical processes were actually studied) by virtue of the pulsed excitation source (ruby laser) and the simultaneous detection of all Raman frequencies by photographic spectroscopy. The advent of the scanning double monochromator, while a great advance for c.w. spectroscopy, spelled the temporary end of time resolution in Raman spectroscopy. The time-resolved techniques began to be revitalized in 1968 when Bridoux and Delhaye (16) adapted television detectors (analogous to, but faster, more convenient, and more sensitive than, photographic film) to Raman spectroscopy. The advent of the resonance Raman effect provided the sensitivity required to detect the Raman spectra of intrinsically dilute, short-lived chemical species. The development of time-resolved resonance Raman (TR ) techniques (17) in our laboratories and by others (18) has led to the routine TR observation of nanosecond-lived transients (19) and isolated observations of picosecond-timescale events by TR (20-22). A specific example of a TR study will be discussed in a later section. 

The effect of tetrachlorate ions on water structure has been investigated with laser Raman spectra by Walrafen 213), and Lippin-cott etal. 212a) studied poly water configurations. There are numerous other investigations of laser-excited Raman spectra, the discussion of which would demand a special review article 2i3b-f). 

Fig. 2.8. Laser Raman spectra obtained (a) for a polyacrylonitrile (PAN)-based HMS4 carbon fiber, and (b) for a pitch-based P75S carbon fiber. After Robinson et al. (1987).

The Laser Raman spectra of various chromates have recently been repeatedly reported (77—82). A collection of the more relevant results for both the infra-red and Raman investigations are compiled in Table 6. Here it is evident that in general fewer bands have been observed than theoretically should appear. In particular the V2 deformation has in most cases not yet been observed in the IR and the vn bands are often not split into all the theoretically predicted components. 

Eysel and 8under showed by Raman spectroscopy that all sulfur-selenium phases obtained by recrystallization of commercial 8682 and of an equimolar melt contain 8e8e bonds even at very low selenium contents. The composition of the samples studied varied from 800 0587 95 to 865 9821- These results were confirmed and extended by the present authorswho measured the low temperature laser Raman spectra of four sulfur-selenium phases obtained by recrystallization of the... 

S. R. Levitt, K.C. Blakeslee, R.A. Condrate, Infrared spectra and laser-Raman spectra of several apatites, Memoires de la Societe Royale des Sciences de Liege, Collection in 8 20 (1970) 121-141. 

For a series of 2,2-diaryl AT-oxides Vc=n and Vn q have been correlated respectively with bands in the ranges 1560-1619 and 1120-1180 cm". Both symmetric (1520cm ) and antisymmetric (1570, 1590cm" ) C=N modes have been assigned in two isomeric 2,2-dimethyl N-oxides the latter were inactive in the laser Raman spectra. ... 

Laser Raman spectra were obtained with the 647.1 nm line of a krypton ion laser (Lexel, Model 95). The radiation intensity at the sample was 300 mW. The scattered radiation was passed through a double monochromator... 

Figure 2. Laser Raman spectra of pure liquid reference compounds.

Figure 3. Laser Raman Spectra of MnMo04 and 4 % K/MnMo04 Catalysts.

D. Deconvolution of Pure Rotational Laser Raman Spectra 221... 

We conclude this chapter by presenting several examples of deconvolution of real data. Most of these examples represent deconvolutions of data that were used as part of a spectral analysis rather than generated as deconvolution examples or tests. The examples include high-resolution grating spectra, tunable-diode-laser (TDL) spectra, a Fourier transform infrared spectrum (FTIR), laser Raman spectra, and a high-resolution y-ray spectrum. 

---