摘要: Publisher Summary This chapter describes various aspects of thermal energy ion-molecule reactions. Some new experimental techniques have led to a great deal quantitative information on reactions, especially for reactions involving small molecules at low energies. The majority reaction rates has been measured in experiments utilizing the ion source mass spectrometer. A product may be produced from several and separation into component is often uncertain. ability vary can used advantage spectrometer sources, as dependence investigated this way. few endothermic studied with accelerating field supplying sufficient kinetic make observable. atomic positive ions are weak plasma largely deexcited ground state by superelastic collisions electrons before reaching neutral port. ion-atom interchange also elaborated chapter.