Polarizers/Polarization absorption spectra

Absorption Spectrum The polarized absorption spectrum of a single crystal of aspirin was measured which indicated that aspirin may be spectroscopically treated as perturbed benzoic acid.59... 

Fig. 11. Overall polarized absorption spectrum of 3EHS Ir, i.e. Ir4+ doped in (ethyl3NH)2[SnCl6], at 15 K. Incident light perpendicular to the (10T) crystal plane (see Ref. [26])...

Fig. 13. Polarized absorption spectrum (low energy part) in two extinction directions (cf. Ref. [96]) of rrans-[Co(NH3)4(CN)2]Cl at 4.2 K...

The polarized absorption spectrum of 1,6-naphthyridine-de in naphthalene at 4 K in the region of the first two excited singlet states is shown in Fig. 3. The lowest singlet system with origin at 28794 cm-1 has been assigned 1A" nn ) 83>. The origin of the second singlet system has not been identified but comparison with the naphthalene spectra and the nature of the 1,6-naphthyridine-de spectrum... 

In the application of high-resolution imaging based on the near-field recording technique, it is interesting to observe various light properties such as polarization, absorption spectrum, fluorescence, and so forth, in near-field regions with the combination of functionalized films for the measurement of these properties. The system has the potential of being an application of the material science of thin films. 

U(III) in an alkaline earth fluoride matrix was one of the earlier laser materials 49h). As might be expected with crystalline substances, the splitting of the various J levels can be completely resolved, especially at low temperatures. Thus the polarized absorption spectrum of in a lanthanum chloride matrix (Csh environment) has been measured from 5600 to 25,000 cm and analyzed in detail. The ground state yields 5 sublevels in this symmetry, the state yields 6 sublevels, and 20 lines result from the combination of these two levels (50, 51). 

Bulletin of the Chemical Society of Japan Figure 8c. Polarized absorption spectrum of trans-cinnamic acid a-form through the (010) plane. —the... 

Figure 8a, Theoretical reproduction of the polarized absorption spectrum of cinnamouloxy group, Ss is shown in the next page. —the...

Figure 4. A single-crystal polarized absorption spectrum of at 4.2K...

Dijkgraaf, C. (1965) Interpretation of the polarized absorption spectrum of copper acetylacetonate. Theoret. Chim. Acta 3, 38. 

FIGURE 2.1.26 -Polarized absorption spectrum (a), photoluminescence spectrum (PL), cw luminescence excitation spectrum (PLE) — monitored at 570 nm (dashed line) and 620 nm (dotted line) — and excitation spectrum of the microsecond luminescence transient induced by -polarized light (open circles) in rubrene single crystals. (From Najafov, H. et al., Phys. Rev. Lett., 96, 056604, 2006.)... 

The polarized absorption spectrum of TCO4 doped in single crystals of KCIO4 [88 or CSCIO4 [89] was measured at 4.2 K and showed considerably pronounced resolution of the vibrational structure. 

The low temperature, single crystal, polarized absorption spectrum of tetra-methyl-l,3-cyclobutanedione shows four different electronic singlet n n transitions. Analysis of the vibrational structure, polarization behaviour, and intensities, of the bands has allowed their assignments to UuCMj), B2 ( Bi),and Mu(M J... 

Many other measures of solvent polarity have been developed. One of the most useful is based on shifts in the absorption spectrum of a reference dye. The positions of absorption bands are, in general, sensitive to solvent polarity because the electronic distribution, and therefore the polarity, of the excited state is different from that of the ground state. The shift in the absorption maximum reflects the effect of solvent on the energy gap between the ground-state and excited-state molecules. An empirical solvent polarity measure called y(30) is based on this concept. Some values of this measure for common solvents are given in Table 4.12 along with the dielectric constants for the solvents. It can be seen that there is a rather different order of polarity given by these two quantities. 

Nanosecond flash photolysis studies of Ct-nitronaphthalene in polar and nonpolar solvents led to the detection of the trip let-triplet absorption spectrum of this nitrocompd (Ref 26). 

Fig. 13. Absorption spectrum of vivianite (FejCPOJj-8H2O) showing the MMCT transition. This transition shows a strong polarization dependence (simplified from Ref. [68])...

---