Investigation of the Dynamics and Threshold Behavior of Endothermic Negative Ion-Neutral Reactions. Final Report, July 15, 1980-July 14, 1983

摘要

These studies have yielded thermochemical and scattering data which are needed for understanding the ion chemistry of plasmas, and in the development of certain devices which utilize plasmas, such as MHD generators. In the course of these studies, the characteristics of various negative ion sources, including conventional electron impact, sputtering and glow discharge sources, have been extensively explored. Energy thresholds for selected collision-induced dissociation reactions involving PO exp - , PO sub 2- , CO sub 3- , and NO sub 3- have been determined, and ionic bond dissociation energies, heats of formation and electron affinities of the corresponding neutral molecules have been derived from these data. In addition, energy thresholds for endothermic electron transfer reactions involving PO exp - , PO sub 2- , CO sub 2- , FeO sub 2- , BO exp - , BO sub 2- , MoO exp - , MoO sub 2- , MoO sub 3- , WO sub 2- and WO sub 3- have been determined, and again, these data were utilized to calculate electron affinities of the corresponding molecular species. A crossed ion-molecular beam scattering apparatus has been used to investigate the kinetics, dynamics and energy transfer characteristics of the negative ion-neutral reactions, O exp - + H sub 2 (D sub 2 ) implies OH exp - (OD exp - ) + H(D) in very low translational energy regime. (ERA citation 09:001431)