ABSTRACT
The results presented in this book show that multifrequency EPR spectroscopy is a method that allows one to obtain qualitatively new information on molecular dynamics, transfer mechanism of spin carriers, magnetic and relaxation properties of conjugated polymers and their nanocomposites, and other low-dimensional condensed systems. This facilitates solving various practical problems in physics, chemistry, molecular biology, and interdisciplinary sciences. A higher spectral resolution of a millimeter wave band EPR provides enhanced accuracy in the measurement of magnetic resonance parameters and makes g-factor of organic free radicals an important characteristic. The method enables to resolve individual contributions of organic radicals with close magnetic resonant characteristics, to provide their reliable identication, and to establish the correlation between structural, dynamic, and magnetic parameters of such systems. Besides, the interaction between different spin packets is weakened signicantly in high magnetic elds, so they may be considered as noninteracting and their parameters can be determined more precessionally. It allows obtaining qualitatively new information on the metrology of free radicals, molecular dynamics and electron mobility, electron and dimensional structure of paramagnetic centers, matrix’s morphology, polarity, etc. Therefore, it can be reliably and efciently used in the study of different molecular and electron processes realized in various polymer systems. This provides the unique possibility of the registration of ne structural and morphologic transitions, as well as electronic processes in these compounds with their following interpretation in the frames of appropriate theories. It should be noted that EPR spectroscopy is still developing and not all its abilities are exhausted so far. All these allow one to hope that the novel millimeter wave band technique combined, for example, with the multiresonant and pulse approaches, will be very bene- cial in the future for the increase in informativity and the advancement of EPR methods.
