Stråhlman Christian, Kivimäki Antti, Richter Robert, Sankari Rami
MAX IV Laboratory, Lund University , P.O. Box 118, 22100 Lund, Sweden.
Consiglio Nazionale delle Ricerche -Istituto Officina dei Materiali, Laboratorio TASC, 34149 Trieste, Italy.
J Phys Chem A. 2016 Aug 18;120(32):6389-93. doi: 10.1021/acs.jpca.6b06207. Epub 2016 Aug 5.
We report yields of mass-resolved negative ions and positive ions measured in coincidence after core excitation of water molecules. The analysis of negative-ion/positive-ion and negative-ion/positive-ion/positive-ion coincidence events provides new information on pathways leading to negative ion production, enhancing the present understanding of the dissociation processes of the water molecule. Dissociation following (resonant) Auger decay dominates negative ion production, but radiative decay is shown to contribute above the O 1s ionization threshold. A peak in the H(-)/O(+) yield above the O 1s threshold is attributed to decay from doubly excited states.
我们报告了在水分子核心激发后同时测量的质量分辨负离子和正离子的产率。对负离子/正离子以及负离子/正离子/正离子符合事件的分析提供了关于导致负离子产生途径的新信息，增强了目前对水分子解离过程的理解。（共振）俄歇衰变后的解离主导了负离子的产生，但辐射衰变在O 1s电离阈值以上也有贡献。在O 1s阈值以上的H(-)/O(+)产率峰值归因于双激发态的衰变。
