Study on fragmentation dynamics of NH32+ induced by electron impact

IF 1.4 3区物理与天体物理 Q3 INSTRUMENTS & INSTRUMENTATION Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms Pub Date : 2024-10-22 DOI:10.1016/j.nimb.2024.165547

Yingying Wang, Yutian Li, Yang Gao, Yiming Chen, Zhanrong Zhou, Xiaofang Shen, Guofeng Jin

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Abstract

In this study, the fragmentation dynamics of ammonia are investigated using the 205-eV electrons impact ionization by a reaction microscope. The two- and three-body dissociation channels of NH₃²⁺ ions are identified by the coincidence measurement of fragment ions, and the dication electronic states are determined. In the three-body dissociation channel, including the Dalitz plots and Newton diagrams, the partitioning of the neutral hydrogen’s energy provides a deeper understanding of the fragmentation mechanisms. Using the energy of hydrogen as a filter, the discovery of two electronic states provides a more specific explanation of the mechanism of the direct dissociation process. By employing the kinetic energy (KE) of fragments, the mechanisms of three-body dissociation channels have been further validated. This study provides more detailed information for subsequent research on the dissociation dynamics of ammonia.

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电子撞击诱导的 NH32+ 碎片动力学研究

本研究利用反应显微镜的 205-eV 电子冲击电离技术研究了氨的碎片动力学。通过对碎片离子的巧合测量，确定了 NH32+ 离子的二体和三体解离通道，并确定了二价电子态。在三体解离通道中，包括达利茨图和牛顿图，中性氢的能量分区让我们对碎片机制有了更深入的了解。利用氢的能量作为过滤器，两种电子状态的发现为直接解离过程的机制提供了更具体的解释。通过利用碎片的动能（KE），进一步验证了三体解离通道的机制。这项研究为后续的氨解离动力学研究提供了更详细的信息。

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来源期刊

Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms 物理-核科学技术

CiteScore

2.80

自引率

7.70%

发文量

231

审稿时长

1.9 months

期刊介绍： Section B of Nuclear Instruments and Methods in Physics Research covers all aspects of the interaction of energetic beams with atoms, molecules and aggregate forms of matter. This includes ion beam analysis and ion beam modification of materials as well as basic data of importance for these studies. Topics of general interest include: atomic collisions in solids, particle channelling, all aspects of collision cascades, the modification of materials by energetic beams, ion implantation, irradiation - induced changes in materials, the physics and chemistry of beam interactions and the analysis of materials by all forms of energetic radiation. Modification by ion, laser and electron beams for the study of electronic materials, metals, ceramics, insulators, polymers and other important and new materials systems are included. Related studies, such as the application of ion beam analysis to biological, archaeological and geological samples as well as applications to solve problems in planetary science are also welcome. Energetic beams of interest include atomic and molecular ions, neutrons, positrons and muons, plasmas directed at surfaces, electron and photon beams, including laser treated surfaces and studies of solids by photon radiation from rotating anodes, synchrotrons, etc. In addition, the interaction between various forms of radiation and radiation-induced deposition processes are relevant.