Absorption coefficents

Unlike the triplet contributions to the absorption spectrum, the singlet contributions have a strongly temperature-dependent absorption coefficent k. A fit between the experimental spectrum of Figure 4 and calculated spectra as in Figure 3 yields T = 1900 ( 200) K for the -X 2g maximum and T = 2700 ( 200) K for the A 2 <- X 2g satellite. The difference can be explained by the different temperature dependenees of k in conjunction with the radial temperature profile of the discharge. 

X-ray absorption coefficients are listed in the International Tables of Crystallography IIP 2) From the numerous empirical formulae used for the Computation of X-ray absorption coefficents we just mention... 

The metallated PDA (6a) and the metal-free polymer have previously been investigated using picosecond-resolution fluorescence lifetime studies and a picosecond characterization of the two photon absorption coefficent, p the latter has... 

For pressures below p the peak absorption coefficent decreases linearly with pressure, but the Doppler linewidth does not (Equation 1.28), so there is no advantage in terms of spectral resolution in working below this critical pressure and a nett disadvantage in terms of sensitivity. Above p, ad,max becomes constant and the true linewidth increases linearly with pressure. 

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