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PiFM spectra generally replicate conventional IR spectra recorded from bulk samples, shown in this example of polyethersulfone (PES). Occasionally, slight shifts in peak wavenumber and amplitude are observed in PiFM spectra, arising from the extreme sensitivity of PiFM to localized populations of molecules. One strength of the PiFM method is capturing the behavior of materials in very small amounts and in confined spaces – environments that can differ greatly from samples on larger scales.
PiFM and FTIR of PES (Polyethersulfone)
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