This book covers the recent NMR studies with the application of gaseous molecules. It comprehensively covers all aspects of the area, with particular emphasis on new multinuclear experiments that deliver spectral parameters of isolated molecules and provides the most accurate values of nuclear magnetic shielding, isotropic spin-spin coupling and relaxation times, advanced, precise and correct theoretical descriptions of spectral parameters of molecules and the application of gas-phase NMR measurements to chemical analysis and medicine. Aimed at graduates and researchers in analytical chemistry and researching the applications of NMR in medicine, this book is presenting the connections of sophisticated experiments with the theory of magnetic parameters and the exploration of new methods in practice.