Chemical composition tensor

Unfortunately, the chemical composition tensor is not a directly measureable quantity. Instead, it must be deduced from indirect data. In the first place, spectroscopic measurements will usually be used to identify and quantify the chemical substances present. There may or may not be a one-to-one relationship between the intensity at one particular wavelength and the local concencentration of a particular chemical entity. In the second place, if the analysis is to be three-dimensional and non-destructive, the chosen range of electromagnetic... 

Composite-pulse decoupling schemes like WALTZ [36, 37], DIPSI [38], or GARP [39], which are used in solution-state NMR, have failed to offer any significant improvements in the solid state compared to CW decoupling. The residual line width in CW-decoupled spectra is dominated by a cross term between the chemical-shielding tensor of the protons and the heteronuclear dipolar-coupling tensor [40, 41]. 

The desired endpoint of the task of analytical chemistry with spatial resolution is a list of the analytes present, their amounts, and the spatial locations of each. The best means for organizing such a list is in the form of a "chemical composition/distribution tensor, C, each element of which is a vector c of dimension 3+R, whose first three elements refer to the specific location in space, and the remaining R elements give the amounts of each of the R distinct chemical components recognized, i.e. 

Fourier transform infrared (FTIR) spectra of the 3% CP, 6% CP, and 9% CP composites were recorded on a Bruker Tensor 27 single-beam instrument at 16 scans with a nominal resolution of 4cm Absorption spectra were saved from 4000 to 700cm . The FTIR analysis was conducted in order to better understand the nature of interactions between the two polymers. As discussed previously, it is expected that the interaction between the CP molecules and the PSMP molecules should be physical instead of chemical, which can be validated by FTIR spectra. 

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