Dichroic ratio fitting

It was found that In D decays linearly with time [where D is the dichroic ratio defined in Eq. (2)]. The time constant for the decay of the dichroism, r, is plotted vs temperature-1 in Fig. 25. It was shown (Stavola et al., 1988b) that the time constant, r, for a single H jump from one BC site adjacent to the B to another given by r=4r. From the fit to the data shown in Fig. 25 the following expression for the time constant for a single H jump was obtained ... 

Fig. 26 Dichroic ratios in absorption (R) as a function of Mn as measured at 380 nm. The open squares correspond to the samples annealed at 80 °C for 10 minutes and the solid squares those at 180 °C for 18 h. A dotted line shows M, the Nem-Hex transition point of PF2/6. An inset shows the region of an exponential drop between Mn = 104-105 g/mol and a linear fit. Reprinted with permission from [55]. (2005) by the American Chemical Society...

The MO in the film can be determined by fitting the dichroic ratio (DR) of a selected band in ATR [517, 518, 559, 608-617] or IRRAS [558, 618-620] spectra or the ratio of the band intensities in the metallic IRRAS and normal-incidence transmission spectra [551, 621], which will be referred to below as the DR fitting approach. In the spectroscopy of ultrathin films, the DR is defined as the ratio of the peak (or integrated) intensity of the absorption band in the y-polarized spectrum. A", to that in the p-polarized spectrum, A ... 

First, the ratio is constructed from the spectra at each rotation angle a or tilt angle / with the help of the linear correlation analysis (K. Fahmy, personal communication) A(a)/A(o=0) [A(/ )/A(/ =0)]. The ratio of each transition moment as a function of the angle a or can thus be obtained. This theoretical function can be calculated with the help of the Jones Formalism (4) and this function is necessary for fitting the ratios at o=90 and 0=90 degrees to obtain the dichroic ratio Ax/Ay and Ay/Az. Finally the normalized absorption axes can be determined. 

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