of Volume 1.- 1. Introduction.- 2. Positive-Ion—Molecule Reaction Studies in a Single Electron-Impact Source.- 1. The Continuous Ion Extraction Source.- 2. Establishment of Ion-Molecule Reactions.- 3. Reaction Kinetics.- 4. The Pulsed Ion Source.- 5. Energy Effects in Ion-Molecule Reactions.- 6. Rate Method of Identifying Two Precursors of a Single Product.- 7. Reactions and Reaction Kinetics at Elevated Pressures.- 8. Reactions of Electronically Excited Ions.- 9. Residence Times from Mobilities.- 10. Energy Distribution in Products of Ion-Molecule Reactions.- 11. Proton Affinities.- References.- 3. Ion-Molecule Reactions by Photoionization Techniques.- 1. Introduction.- 2. Experimental Technique.- 2.1. Optical Monochromator.- 2.2. Light Sources.- 2.3. Mass Spectrometers.- 2.4. Ion Sources and Reaction Chambers.- 2.5. Pulse Techniques.- 3. Photoionization Theory.- 3.1. General.- 3.2. Direct Ionization.- 3.3. Autoionization.- 3.4. Ion-Pair Formation.- 3.5. Preparation of Pure Ion Species.- 3.6. Identification of Reactant Ions.- 3.7. Preparation of Ions in States of Known Internal Energy.- 4. Reactions of Pure Ion Preparations.- 4.1. Reactions in Propylene and 1,3-Butadiene.- 4.2. Reactions in Methane.- 4.3. The Pulse Experiments of Warneck.- 4.4. High-Pressure Photoionization; Reactions of C4H 8+.- 4.5. Endoergic Reactions; Determination of Heats of Formation from Thresholds.- 5. Reactions of Ions with Known Internal Energies.- 5.1. Reactions of NH3+ with NH3 and H2O.- 5.2. Reactions of H2+ with H2.- 5.3. Reactions of H2+ with He, Ne, and Ar.- 5.4. Charge Transfer in H2.- References.- 4. Negative-Ion—Neutral Reactions.- 1. Introduction.- 2. Sources of Negative Ions.- 2.1. Dissociative Attachment.- 2.2. Three-Body Attachment.- 2.3. Ion-Pair Production.- 2.4. Radiative Attachment.- 2.5. Ion-Neutral Reactions.- 3. Experimental Techniques.- 3.1. Ion-Source Method.- 3.2. Double Mass-Spectrometer Method.- 4. Experimental Results.- 4.1. Reactions of H- and D-.- 4.2. Reactions of C-.- 4.3. Reactions of O- with H2 and with O2.- 4.4. Reactions of O- with Some Triatomic Molecules.- 4.5. Additional Reactions with Diatomic and Triatomic Molecules.- 5. Postscript.- References.- 5. Rate Constants and Cross Sections.- 1. General Survey.- 1.1. Introduction.- 1.2. Accuracy—Present Status and Present Need.- 1.3. Nomenclature.- 1.4. The Ideal Experiment: Successive Refinement in the Determination of a Reaction Rate.- 1.5. Survey of Chapter Contents.- 2. Rate Constants and Cross Sections—Some Formal Considerations.- 2.1. The Relationship between Rate Constants and Cross Sections.- 2.2. Unfolding Procedures.- 2.3. Nonequilibrium Effects.- 2.4. Conclusions.- 3. Available Techniques.- 3.1. Survey and Organization.- 3.2. Some General Problems.- 3.3. Beam Techniques.- 3.4. Swarm Techniques.- 3.5. Plasma Techniques.- 3.6. Comparative Assessment of Techniques.- 4. Theoretical Prediction of Rate Parameters and Comparison with Experiment.- 4.1. Survey.- 4.2. Close-Collision Cross Sections.- 4.3. Trajectory Calculations over the Potential Energy Hypersurface.- 4.4. Statistical Models.- 4.5. Crossings between Potential Energy Surfaces.- 4.6. Direct Models at High Energies.- 5. Conclusion.- 5.1. Miscellaneous Topics.- 5.2. Recommendations for the Adoption of Standard Procedures.- 5.3. Survey and Prospects.- Notes Added in Proof.- Acknowledgments.- References.- 6. Chemical Ionization Mass Spectrometry.- 1. Introduction.- 2. Experimental.- 3. Mass Spectra of Different Compound Types.- 3.1. Alkanes.- 3.2. Cycloparaffins.- 3.3. Alkenes and Alkynes.- 3.4. Aromatics.- 3.5. C7H8 Isomers.- 3.6. Chemical Ionization of Benzene by Rare Gas Reactants.- 3.7. Esters.- 3.8. Alcohols.- 3.9. Miscellaneous Compounds.- 4. Temperature Effects in Chemical Ionization.- 4.1. Benzyl Acetate and t-Amyl Acetate Spectra at Various Temperatures.- 4.2. Mathematical Formulation of Chemical Ionization Kinetics.- 4.3. Kinetic Results for Benzyl Acetate and t-Amyl Acetate.- 4.4. Pressure Studies with Benzyl Acetate.- 4.5. Substituted Benzyl Acetates.- 4.6. Methoxymethyl Formate and Methoxymethyl Acetate.- 4.7. Methylthiomethyl Acetate and Methylthiomethyl Propionate.- 4.8. Equilibrium Reactions.- References.- 7. Higher-Order Reaction—Ion Clusters and Ion Solvation.- 1. Introduction.- 2. Ion-Molecule Reactions at Conventional Gas Kinetic Conditions.- 3. Apparatus for Mass Spectrometric Studies of Ion-Molecule Reactions at Pressures Above 1 Torr and Thermal Energies.- 4. Kinetics and Mechanism of Clustering Reactions. The Proton Hydrates. Applications.- 5. Ionic Clustering Equilibria—Determination of Enthalpy and Entropy Changes of Clustering Reactions.- 6. Ionic Solvation in the Gas Phase.- 6.1. Application of Gas-Phase Cluster Studies to Ion-Solvent Molecule Interactions and Heterolytic Organic Reactions.- 6.2. Gas-Phase Hydration of Alkali and Halide Ions..- 6.3. The Hydrated Proton in the Gas Phase.- 6.4. Competitive Solvation in the Gas Phase. H+ by Water and Methanol and by Water and Ammonia Molecules.- 6.5. Solvation of Negative Ions by Various Solvent Molecules. Correlation with Acidity.- 7. Entropy Changes of Ion-Clustering Reactions. Comparison between Experimental and Calculated Values.- 8. Determination of Cluster Dissociation Energies by Collisional Studies.- 9. Application of Ion-Cluster Studies to Processes in the Ionosphere, Radiation Chemistry, and Other Fields.- References.