Linewidth measurement

S. S. H. Naqvi, S. M. Caspar, K. C. Hickman, and J. R, McNeil. A Simple Technique for Linewidth Measurement of Gratings on Photomasks. Proc. SPIE. 1261, 495, 1990. K.P. Bishop, S.M. Caspar, L.M. Milner, S.S.H. Naqvi, and J.R, McNeil, rasterization using Scatterometry. Proc. SPIE. 1545, 64, 1991. These papers discusses a simple application of scattering from surhices that are intentionally patterned. 

Adamantane (C10H16) External referencing for 13C spectra, optimizing Hartmann-Hahn match, linewidth measurement, sensitivity measurement [30]... 

The polyethylene linewidths, as illustrated in Fig. 1, clearly indicate that a constant value is attained in the melt between 1-8 X 10. Proton T2 measurements at 150°C indicate that there is a change in slope in this quantity as a function of molecular weight at about = 6 x 10. ( ) The critical molecular weight as determined from bulk viscosity measurements for this polymer has been given as 2 x 10 ( ) and 3.8 x 10. (5 ) These values are very close to those which would be deduced from the linewidth measurements. For polydimethyl siloxane the break in the proton T2-molecular weight curve occurs at about M = 5 x 10. (37) is about 2.5 x 10 from viscosity measurements. ( ) Fig. 5... 

It is possible to estimate the influence of the spectrometer on linewidth measurements by convolving the response function with a mathematical model of the line. The resulting curve may be compared with the observed line and the true width inferred. Hunt et al. (1968) have employed corrections of this type supplied by the author in their determination of carbon monoxide self-broadened linewidths. 

In the linked systems studied by Wegewis and Verhoeven [14], electron-transfer rates were estimated by the same methods—quenching of the acceptor fluorescence and linewidth measurements. The rates were found to vary over many orders of magnitude in the weakly coupled systems they are 10 -10 s (for the reduced forms lr-3r), increasing to lO" s for the double bond conjugated forms 1-3, and... 

Lithium-doped BPO4, another candidate ceramic electrolyte material for lithium batteries has been studied by Li NMR relaxation and linewidth measurements of samples with Li doping levels up to 20 mol % (Dodd et al. 2000). Comparison of the NMR data with values of the second moment calculated for both random and homogeneous models of Li distribution indicate the existence of Li clusters with an intemuclear distance of 3A, possibly consisting of 1 Li ion fixed at a boron vacancy with additional 2 Li ions in the conduction channels surrounding the vacancy. The atomic jump time, determined from measurements of the Li motional narrowing behaviour, indicate a maximum in the Li ionic mobility at the 10 mol % doping level (Dodd et al. 2000). 

Some preliminary results have also been reported on kidney and liver transplant patients. Plasma linewidth measurements were reported on 28 samples from 10 kidney transplant patients at up to 15 days post-transplantation with the lowering of 2W values being ascribed to immunomodulation. IW values were also reported for the plasma of three patients who underwent liver transplantation. 

Most likely the earliest solution work reported was a study of linewidth measurements of the Cu resonance signal in concentrated hydrochloric acid solution containing cuprous and cupric chloride. These studies afforded reasonable calculations for the bimolecular rate constant for the equilibrium electron-exchange process (Eq. 1) ... 

Figure 4. Typical spectra of 611 monolayer. Two spectra taken with a single scan at different surface densities. Complete collapse of the hyperfine is evident although low signal-noise ratio renders accurate linewidth measurements impossible. Scale is the same in Figure 5.

The surfactant properties of alkali metal sulphonates lead to interesting motional properties in solution that can be studied by H and 13C relaxation times. Franses and Miller67 observed segmental motion and phase transitions by 13C NMR in chloro-form/water solutions when studying the surfactant SHBS 29. For the lamellar liquid-crystalline phase formed by SHBS and water, and linewidth measurements indicated a pronounced motional gradient, resulting from anisotropic motion, as the head group is approached. 

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