Dissociation Dynamics of Molecular Ions in High dc Electric Field

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• 作者：Ivan Blum ; Lorenzo Rigutti ; François Vurpillot ; Angela Vella ; Aurore Gaillard ; Bernard Deconihout
• 刊名：Journal of Physical Chemistry A
• 出版年：2016
• 出版时间：May 26, 2016
• 年：2016
• 卷：120
• 期：20
• 页码：3654-3662
• 全文大小：511K
• 年卷期：0
• ISSN：1520-5215

文摘

In an atom probe, molecular ions can be field evaporated from the analyzed material and, then, can dissociate under the very intense electric field close to the field emitter. In this work, field evaporation of ZnO reveals the emission of Zn₂O₂p>2+p> ions and their dissociation into ZnOp>+p> ions. It is shown that the repulsion between the produced ZnOp>+p> ions is large enough to have a measurable effect on both the ion trajectories and times of flight. Comparison with numerical simulations of the ion trajectories gives information on the lifetime of the parent ions, the energy released by the dissociation and repulsion, and also the dissociation direction. This study not only opens the way to a new method to obtain information on the behavior of molecular ions in high electric fields by using an atom probe, but also opens up the interesting perspective to apply this technique to a wide class of materials and molecules.