A text designed for courses in quantum statistical physics, which explains the concept of the density matrix and links it with the quantum theory of relaxation and decoherence and with the most common spectroscopic probes.
This book covers the material for a one-semester introductory course in quantum statistical physics, designed for Master's students in chemical physics and biophysics preparing to work in the fields of NMR, vibrational spectroscopy, or electronic spectroscopy. The course introduces the density matrix formalism and connects it to students' existing knowledge of classical statistical physics. It then presents the main results of quantum relaxation theory in terms of population transfer and decoherence, and relates quantum relaxation to its most widely used experimental probes in spectroscopy.