Optical and Spectroscopic Properties

Vibrational spectral data have been reported for solid thorium tetranitrate hydrates by several investigators [31, 32, 34 to 42]. The most extensive infrared assignments for Th(N03)4 5H20 and Th(N03)4 4H20 are those reported by Ferraro, Walker [39]. Their results are listed in Table 19, p. 71, together with data on Th(N03)4. Raman nitrate modes (in cm ) are reported by Petrov et al. [40] for the pentahydrate at 635, 714 (ve), 740, 762 (vg), 820 (vg), 950, 1035 (V2), 1230, 1323 (V4), 1496, 1536 (v ) and 1625 (5H2O), whereas Ferraro et al. [38] report somewhat different positions, viz., 760, 810,1044,1104 and 1213 cm Bands for the tetrahy-drate occur at 714, 748, 1036, 1487 and 1542 cm i [32]. 

---

It is evident that in representing energy levels in solids extensive use is made of momentum (reciprocal- or k-) space rather than the real-space representations which theoretical chemists frequently employ for the description of isolated molecules. One of the obvious advantages in so doing is that optical and spectroscopic properties are concisely illustrated and the various symmetry-allowed transitions clearly identified with reference to such E/k plots. 

Still within a continuum solvation approach [22,41], a unified treatment of the local field problem has recently been formulated within PCM for (hyper)polarizabilities [47] and extended to several optical and spectroscopic properties, including IR, Raman, VCD and VROA spectra [8,9,11,12],... 

When optical anisotropies form spontaneously in the polymeric film during deposition, the situation is more complicated. Significant effects are observed in optical and spectroscopic properties, such as LED emission [17] and waveguide propagation [45-50,52,64], For these films, accurate evaluation of the optical constants is more difficult and must be based on variable incidence angle measurements, as in the case of surface plasmon resonance [45-47], waveguide propagation [48-50,52], ellipsometry [64,67], and reflectance/transmittance [68]. 

In the following, it will be demonstrated that confocal surface-enhanced Raman microscopy is a powerful tool for exploring optical and spectroscopic properties of molecules adsorbed on silver and gold nanoparticles. It is shown that confocal Raman microscopy coupled with high-resolution electron microscopy has the potential to deliver detailed information about the structure of points of high Raman intensity the so-called hot spots. 

Stmctural, optical, and spectroscopic properties and efficient two-micron lasing of new Tm Lu203 ceramics. Quant Electron 41 863-868... 

Optical and spectroscopic properties of model colloids, rheological properties, electrophoretic properties... 

J. Autschbach. Density functional theory applied to calculating optical and spectroscopic properties of metal complexes NMR and optical activity. Coord. Chem. Reu., 251(13-14) (2007) 1796-1821. 

This section presents information about the optical and spectroscopic properties of fluoroplastics. 

Srivastava P, Singh K (2012) Synthesis of CdSe nanoparticles by solvothermal route structural, optical and spectroscopic properties. Adv Mater Lett 3(4) 340-344... 

---