Atomic and Molecular Processes

Contents Contributors Preface 1. Forbidden Transitions 1. Introduction 2. Forbidden Lines in Atomic Spectra 3. Forbidden Transitions In Diatomic Molecular Spectra 4. Forbidden Transitions in Polyatomic Molecular Spectra 5. Forbidden Transitions in Crystals 6. Forbidden Transitions in Astrophysics References 2. Allowed Transitions 1. Introduction 2. Basic Concepts and Formulae 3. Calculations of Atomic Line Strengths 4. Theory of Molecular Line Strengths 5. Measurements of Atomic Transition Probabilities 6. Measurements of Molecular Transition Probabilities References 3. Photoionization Processes 1. Introduction 2. Experimental 3. Theoretical 4. Results References 4. Photodetachment 1. Introduction 2. Negative Ion Energy States 3. Theoretical Considerations 4. Experimental Method for Photodetachment Studies 5. The H~ Photodetachment Cross Section 6. Photodetachment Cross Sections for 0¿,S¿, and C¿ 7. Photodetachment of Negative Molecular Ions 8. Formation of Negative Ions by Radiative Attachment 9. Atomic Electron Affinities References 5. High-Temperature Shock Waves 1. Introduction 2. Hydrodynamic Considerations 3. Plane Shock Waves 4. High-Energy Cylindrical Shock Waves 5. Establishment of Equilibrium Plasmas 6. Experimental Vérification of the Rankine-Hugoniot Relations in Conventional Shock Tubes 7. Shock-Heated Plasmas as Thermal Light Sources References 6. Attachment and Ionization Coefficients 1. Electron Attachment 2. Ionization Coefficients 3. Attachment Coefficients References 7. Electronic Recombination 1. Collisional-Radiative Recombination 2. Recombination Involving a Free-Bound Radiationless Transition 3. Experimental Studies References 8. Ionic Recombination 1. Three Body 2. Two Body References 9. Elastic Scattering of Electrons 1. Scattering by a Potential Field 2. Measurement of Collision Cross Sections 3. Scattering by Hydrogen Atoms 4. Scattering by Complex Atoms and Ions 5. Scattering by Molecules References 10. The Motions of Slow Electrons in Gases 1. Introduction 2. Theory of Motion of Ions and Electrons in Gases 3. Diffusion and Drift 4. Equation of Continuity 5. Mean Loss of Energy in Elastic Encounters 6. The Distribution Function f(c) 7. The Ratio W/D 8. Measurement of Mean Energy Lost in an Encounter 9. Experimental Procedure 10. Experimental Results 11. The Losses of Energy by Electrons in Colliding with Gas Molecules References 11. The Theory of Excitation and Ionization by Electron Impact 1. Classical Theory 2. General Quantum Theory 3. Partial Wave Theory 4. Calculated and Measured Cross Sections 5. Collisional Excitation Treated as a Radiative Process Appendix References 12. The Measurement of Collisional Excitation and Ionization Cross Sections 1. Introduction 2. Electron Impact Studies 3. Ion Impact Studies 4. Neutral Impact Studies 5. Electron-Ion Collisions References 13. Spectral Line Broadening in Plasmas 1. Introduction 2. Basic Considerations 3. The Impact Approximation 4. Applications of the Impact Approximation to Broadening by Electrons 5. Corrections to the Impact Approximation 6. Broadening by Ions 7. Comparison with Experiment References 14. Theoretical Treatment of Collisions between Atomic Systems 1. First Born Approximation 2. Higher Approximations 3. Slow Collisions References 15. Range and Energy Loss 1. Energy Loss of Charged Particles 2. Range of Charged Particles 3. Ionization by Charged Particles 4.