Anatoly M. Pravilov is a Professor of physics at Saint Petersburg State University, Russia.Pravilov teaches kinetics and mechanisms of gas-phase processes and radiometry. The focus of his current research interests lies in gas-phase photochemistry as well as spectroscopy and dynamics in small molecules and weakly bound complexes. He has already published a book on Photoprocesses in Molecular Gases, in 1992 in Russia, a Springer book on Radiometry in Modern Scientific Experiments, in 2011 and a Springer book on The Iodine Molecule: Insights into Intra-and Intermolecular Perturbations in Diatomic Molecules, in 2018.

• 1. Introduction.- 2. General Kinetic Rules for Chemical Reactions, Collisional, and Intramolecular Processes.- 2.1. Rates of Reaction, Collisional, and Spontaneous Processes. Rate Constant. Kinetic Types of Simple Processes.- 2.2. Chemical Equilibrium. Equilibrium Constant.- 2.3. Arrhenius equation.- 2.4. Complex Reactions.- 2.4.1. Consecutive Reactions. Steady-state Method.- Problems.- References.- 3. Theory of Elementary Processes.- 3.1. Cross-sections, Rate Constants, and Probabilities of Elementary processes.- 3.2. The detailed balance principle. Adiabatic approximations. Potential Energy Curves and Surfaces.- 3.3. Descriptions of Collisional Processes using Potential Energy Curves and Surfaces. Intramolecular Vibrational Relaxation in Polyatomic Molecules.- 3.4. Non-adiabatic Transitions. Perturbation theory. Probabilities of Adiabatic and Non-adiabatic Transitions.- 3.5. Intermolecular Interactions. Types of Intermolecular Interactions.- 3.6. Semiempirical Model Potentials.- Problems.- References.- 4. Photoprocesses.- 4.1. Primary and Secondary Gas-Phase Photoprocesses. Quantum Yields of the Gas-Phase Photoprocesses.- 4.2. Optical Transitions. Selection Rules for Optical Transitions. Spin-Orbit Coupling and Spin-Forbidden Radiative Transitions.- 4.3. Absorption. Absorption Band Intensities. Einstein Transition Probabilities. Oscillator Strength. Transition Dipole Moment. Beer-Lambert Law.- 4.4. Franck-Condon Principle for Bound-bound and Bound-free Optical Transitions.- 4.5. Luminescence. Radiative lifetime. The Relationship between Einstein Transition Probabilities and Transition Dipole Moment.- 4.6. Intramolecular Perturbations. Selection Rules and Franck-Condon Principle for Intramolecular Perturbation. Perturbations between Bound States. Abnormally long Radiative Lifetime.- 4.7. Spontaneous Predissociation of Two-, Tri- and Polyatomic Molecules. Classes of Predissociation Processes.- 4.8. Photodecayof Two-, Tri- and Polyatomic Molecules. Long-lived States of Polyatomic Molecules.- References.- 5. Energy Transfer in Collisions.- 5.1. Translational-Translational Energy Transfer (T-T exchange).- 5.2. Rotational-Translational Energy Transfer (R-T exchange).- 5.3. Vibrational Energy Transfer (V-T, V-R,T Processes).- 5.4. Non-adiabatic Coupling and Vibrational Energy Transfer.- 5.5. Collision-Induced Non-Adiabatic Transitions.- 5.6. Collision-Induced Predissociation.- 5.7. Vibrational Relaxation via Several Electronic States.- 5.8. Electronic Deactivation.- Problems.- References.- 6. Weakly-Bound Complexes.- 6.1. Hydrogen- and Halogen-Bond Complexes.- 6.2. Van der Waals Complexes. 6.3. Rare gas-halogen Molecule Clusters.- References.- 7. Termolecular reactions.- 7.1. Termolecular recombination. Mechanism of Termolecular Recombination.- References.- 8. Chemiluminescence.- 8.1. Classes of Chemiluminescence Processes.Gas-P Rate Constants.- 8.2. General Rules of Radiative Recombination.- References.- Solution of Problems.- Index.