Abstract
This paper illustrates the application of CW-EPR combined with the Computer Resolution Enhancement Method (CREM) to the investigation of the phase transitions and molecular dynamics of radicals in pyridinium perchlorate single crystals. The CREM method is based on the Fourier transform, convolution and deconvolution functions and permits determination of the fundamental parameters of the spectra: the number of resonance lines, their positions, relative ratios of intensities and core width parameter. Thanks to the use of the simulation procedure, we are able to determine the widths of individual spectral lines. An example illustrating the advantages following from the application of the CREM method in the analysis of complex CW-EPR spectra of organic radicals is the possibility of determination of basic parameters, such as the spectroscopic splitting factor, hyperfine coupling constants and widths of individual spectral lines in EPR spectra recorded in wide range of temperatures. Phase transitions and changes in molecular dynamics of radicals may imply changes in their electron structure, which may affect the above-mentioned parameters of CW-EPR spectra.
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