Several years ago I compiled a photometrically accurate 6 cm-1
spectral library of 18 common extrudable polymer resins. The
feature of this library is that each spectrum is a collage of
of different thicknesses of the resin, normalized to produce a
accurate spectrum of the polymer with a linear photometric range
5 orders of absorbance magnitude. The "absorbance scale" is
for a 50 µm thickness, even though multiple resin
several millimeters down to a few micrometers were measured for
Index-matching was used to minimize Christensen contributions to
samples. When needed (e.g., paper), index matching and a
approach were used to approximately null scattering contributions
absorbance value. The best and most typical examples
each polymer were selected, but in most cases the exact source of
cannot be revealed. The spectra are presented both in JCAMP
and in Galactic .spc format.
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