The book discusses the methodology and experimental setup of Ultrafst Chemical Exchange Spectroscopy in details. Some application examples of the new method are also included. The method has been successfully applied to the study of fast chemical exchange phenomena in liquid solutions at room temperature. The formation and dissociation dynamics of weak intermolecular interactions were monitored in real time with the method. For interaction enthalpies from -0.6 kcal/mol to -3.3 kcal/mol, the dissociation time constants vary from 3 ps to 140 ps. The dissociation rates of the interactions are...