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Negative Ions Made by Collisional Ionization
Collisional Ionization Studies of Rubidium Atoms and Small Halogenated Molecules near Reaction Thresholds
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Negative ions are common in solutions and important§in many biological processes, but they are far less§well-characterized in the gas phase compared to§positive ions. One of the reasons is that it is hard§to make a thermodynamically stable negative ion in§the gas phase. Directly attaching a low energy§electron to a molecule could produce a transient§negative ion, which usually autodetaches an electron§or fragments to release the excess energy. In this§work, alkali metal atoms are used to collide with§halogenated molecules in crossed supersonic beams.§Electron transfer occurs during the collision and a§positive-negative ion pair is produced. The transient§negative ion can release part of its excess energy to§the alkali positive ion in the form of translation§and a stable negative ion could be formed. The§energetics of the collision is studied and the§electron affinities of the negative ions are§measured. This study opens a new pathway to produce§negative ions and provides insight into the electron§transfer mechanism. It is useful to professionals in§the field of gas phase ion chemistry, or anyone else§who may be considering utilizing this method to make§biological negative ions.
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