Polarizers/Polarization transmittance

Numerous new modes emerge below Tc in the FIR [28-32] and Raman [33-37] spectra of a -NaV205. Fig. 8 presents FIR polarized transmittance in a spectral range from 55 to 350 cm 1 at temperatures above and below Tc. Arrows show new low-temperature modes. Some of them clearly split into doublets (see inset of Fig 8). The number and polarization properties of all the observed new LT modes in a -NaV205 can be reasonably described within the conception of folded vibrational modes of the dimerized Fmm2 crystal structure. Observed FIR doublets and close frequencies in different polarizations are naturally explained by their origin from the Q-point quadruplets folded into the zone center [30]. 

Fig. 2.2. Polarized transmittance (dashed line) and near-normal-incidence reflectance (continuous line) spectra of highly stretch-oriented PPV...

Figure 6.4-15 ATR response R calculated for ten internal reflections versus sample thickness for both polarizations. Transmittance is given for comparison. Parameters = 2.4 ip = 45° 2 = 1.35 k2 = 0.03.

Figures Polarized transmittance (dashed lines) and reflectance (full lines) spectra of highly stretch-oriented PPV free standing films. Elongation ratio 3. Spectra are plotted in nanometers (Left panel) to better display the interference patterns in the near infrared or electron volts (right panel) to show the main electronic transition in the UV-Vis.

Major advances m NMR have been made by using a second rf transmitter to irra diate the sample at some point during the sequence There are several such techniques of which we 11 describe just one called distortionless enhancement of polarization transfer, abbreviated as DEPT... 

Introduction of first one, and then two, CH2 groups between the benzene ring and C02H progressively reduces the susceptibility of the acid s ionisation to the polar effect of the substituent X in the benzene ring. The susceptibility, as revealed by the value of p, rises again for (16), however, as CH=CH is a markedly better transmitter of electronic effects than is CH2—CH2. 

The idea of frequency selectivity is certainly not restricted to J-coupling mediated polarization transfer. Furthermore, frequency selective polarization transfer can also be realized by DQ recoupling techniques. For the technique of shift-evolution-assisted selective homonuclear recoupling (SEASHORE), which employs POST-C7 to construct an effective DQ coupling [82, 83], frequency selective polarization can be achieved when the transmitter offset is set to the... 

Fig. 2.5. p- and j-polarized vs transmittance spectra of the monolayer l2Cl[Pg.9]

Fig. 2.6. p- and -polarized vt transmittance spectra of the monolayer 12C1602/NaCl(100) at T- 80 K (C02 pressure lxlO 9 mbar, instrumental resolution 0.05 cm-1).40... 

Optical Microscopy and Transmittance Measurement. A microscope equipped with polarizing optics and thermostatted stage was used in certain studies described below. Transmittance measurements were made by use of a power meter (Lexel model 504) positioned close to the cell, on the optic axis of the incident beam. The cell was mounted on the light scattering stage for these measurements, and the transmittance was determined for light with wavelength 647 nm. 

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