This text is based upon the authors' long experience of teaching the subject to a mixed audience, in the extreme case ranging from physics to biology. The potential of the method is illustrated with applications in fields such as molecular science, catalysis and environmental sciences, polymer and materials sciences, bio-chemistry and  radiation chemistry/physics, which were selected from the authors' wide experience. Theoretical derivations have in general been omitted, as they have been presented repeatedly in previous works. The necessary theory is instead illustrated by practical examples from the literature.

"Principles and Applications of ESR Spectroscopy" provides the principles of continuous wave and pulsed ESR techniques and illustrates the applications at a level that is accessible to masters and doctoral students as well as to scientists in physical chemistry/chemical physics, catalysis and environmental sciences, polymer science, free radical chemistry in bio-chemistry and medicine, materials science, radiation dosimetry and dating, as well as radiation physics and chemistry.