Molecules and their Spectroscopic Properties presents a comprehensive collection of geometrical and spectroscopic constants and collisional characteristics for molecules most important in applications, with data on: energy levels, fundamental vibrational frequencies, electron and proton affinities, dipole moments and polarizabilities, ionization potentials and effective cross sections for various elementary processes occurring in laboratory and astrophyiscal plasmas, chemical processes, and molecualr lasers. Besides the tabulated and graphical material, the most important physical notations and fundamental relationships are included, too. The up-to-date reference data presented will be usefull for specialists working in molecular spectroscopy, physics of molecular collisions, and laser physics.

1 Molecular Structure.- 1.1 Classification of Chemical Bonds and Molecular Terms.- 1.1.1 Electronic Energy Levels.- 1.1.2 Vibrational Energy Levels.- 1.1.3 Rotational Energy Levels.- 1.2 Coupling Schemes.- 1.3 Quantum Chemistry Methods.- 1.4 Equilibrium Form of Molecules.- 1.5 Potential-Energy Curves.- 1.6 Corrections to the Electronic Structure.- 1.6.1 Hyperfine Interaction and Isotope Effect.- 1.6.2 Relativistic Effects.- 2 Spectroscopic and Geometrical Constants of Molecules.- 2.1 Constants of Diatomic Molecules.- 2.2 Fundamental Vibrational Frequencies of Polyatomic Molecules..- 2.3 Rotational Constants and Geometrical Parameters of Polyatomic Molecules.- 3 Energy Constants of Molecules.- 3.1 Bond Dissociation Energies.- 3.2 Ionization Potentials.- 3.3 Electron Affinities.- 3.4 Proton Affinities.- 4 Electrical Properties of Molecules.- 4.1 Dipole Moments.- 4.2 Multipole Moments.- 4.3 Molecular Polarizabilities.- 5 Molecular Spectra.- 5.1 Types of Transitions and Selection Rules.- 5.2 Oscillator Strengths and Transition Probabilities.- 5.2.1 Rotational Spectra.- 5.2.2 Vibrational and Vibrational-Rotational Spectra.- 5.2.3 Rovibronic Spectra.- 5.2.4 Franck-Condon Factors.- 5.3 Photoionization.- 6 Collisions of Molecules with Electrons.- 6.1 Basic Approaches.- 6.2 Types of Collision Processes.- 6.3 Elastic Scattering.- 6.4 Excitation of Molecules by Electron Impact.- 6.4.1 Rotational Excitation.- 6.4.2 Vibrational Excitation.- 6.4.3 Electronic Excitation.- 6.4.4 Resonance Processes.- 6.5 Dissociation and Dissociative Attachment.- 6.5.1 Dissociative Processes.- 6.6 Ionization by Electron Impact.- 6.7 Electron-Ion Recombination and Electron Attachment.- 7 Interatomic Potentials.- 7.1 Interaction Constants.- 7.1.1 Van-der-Waals Interaction.- 7.1.2 The van-der-Waals Equation of State.- 7.1.3 The Lennard-Jones Potential.- 7.2 Energy Potentials of Molecular Hydrogen and Its Ions.- References.