Theoretical chemistry is the discipline that uses quantum mechanics, classical mechanics, and statistical mechanics to explain the structures and dynamics of chemical systems and to correlate, understand, and predict their thermodynamic and kinetic properties. Modern theoretical chemistry may be roughly divided into the study of chemical structure and the study of chemical dynamics. The former includes studies of:; electronic structure, potential energy surfaces, and force fields; vibrational-rotational motion; and equilibrium properties of condensed-phase systems and macro-molecules. Chemical dynamics includes: bimolecular kinetics and the collision theory of reactions and energy transfer; unimolecular rate theory and metastable states; and condensed-phase and macromolecular aspects of dynamics. This book is focused more on the theory than on the computation. It deals primarily with the basic ideas upon which theoretical chemistry is centred, and discusses the equations and tools that enter into the three main sub-disciplines of theory- electronic structure, statistical mechanics, and reaction dynamics.
