Experimental methods employing spin resonance effects (nuclear magnetic resonance and electron spin resonance) are broadly used in molecular science due to their unique potential to reveal mechanisms of molecular motion, structure, and interactions. The developed techniques bring together biologists investigating dynamics of proteins, material science researchers looking for better electrolytes, or nanotechnology scientists inquiring into dynamics of nano-objects. Nevertheless, one can profit from the rich source of information provided by spin resonance methods only when appropriate theoretical models are available. The obtained experimental results reflect intertwined quantum-mechanical and dynamical properties of molecular systems, and to interpret them one has to first understand the quantum-mechanical principles of the underlying processes. This book concentrates on the theory of spin resonance phenomena and the relaxation theory, which have been discussed from first principles to introduce the reader to the language of quantum mechanics used to describe the behaviour of atomic nuclei and electrons. There is a long way from knowing complex formulae to apply them correctly to describe the studied system. The book shows through examples how symbols can be "replaced" in equations by using properties of real systems to formulate descriptions that link the quantities observed in spin resonance experiments with dynamics and structure of molecules.

Praise for 'Theory of Evolution and Relaxation of Multi-Spin Systems': ." it provides a lucid and systematic development of a very complex area of modern theory involving spin dynamics driven by complex, non-commuting hamiltonians. These phenomena are of fundamental importance in NMR, NQR and ESR spectroscopies." "The monograph will be extremely useful both in graduate education and in on-going research." "Dr. Kruk's manuscript is an extremely valuable contribution to our field and is written at the highest level of professional scholarship." "The general scholarly quality and the theoretical level are both very high, thus providing a unique resource to the research community." "Dr. Kruk succeeded to write a comprehensive representation of the theoretical background of spin relaxation. There is no other treatise on magnetic resonance on the market with this multidisciplinary comprehensiveness, clarity of treatment and systematic analysis of spin relaxation."