The KBr pellets were obtained in a standard way, and
contained 1 mg of a particular CP or PEN mixed with 200 mg
of KBr.
The spectra were recorded in the mid IR spectral region
(4000–400 cmK1
Mattson) equipped with WINFIRST program. The latter
permits automatic comparison of two recorded spectra or the
recorded spectrum with the one serving as a reference,
extracted from a database, in the full or truncated spectral
range. From several comparison algorithms available, two have
been tested more carefully in the presented studies:
) using Genesis FTIR spectrometer (ATI
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