Inner-Shell Excitations in Heavy Ion-Atom Collisions (Physics)

重离子原子碰撞中的内壳激发（物理学）

• 批准号: 8705501
• 负责人: Quentin Kessel
• 金额: $ 16.61万
• 依托单位: University of Connecticut
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1987
• 资助国家: 美国
• 起止时间: 1987-06-15 至 1989-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8705501&HistoricalAwards=false
• 关键词: Inner; Shell; Excitations; Heavy; Ion

It is proposed to continue a comprehensive experimental study of the excitation of inner electron shells of heavy atoms by 0.1 to 3.0 MeV ion-atom collisions. This investigation will shed light on curve crossing and other quasimolecular phenomena which occur at small internuclear separations. Two scattering apparatuses are available for this study: The first, completed during the present NSF grant period, detects Auger electrons or characteristic x rays in coincidence with ions scattered to angles between 2 and 20 degrees by single collisions with gaseous targets. The nature of the Auger electron-ion coincidence spectra obtained with this apparatus is surprising and the primary thrust of this proposal will be to continue with this new effort. The data obtained is differential in nature and provides unique and detailed information about the excitation and decay of unusual atomic and molecular states. The second apparatus is a high resolution x-ray spectrometer and will be used to investigate the radiative decays corresponding to the above Auger decays. These efforts will be supplemented with calculations using a Dirac-Fock program. It is the total of these three efforts that will provide new and unique information on the interaction of ion beams with matter. The results of this research will aid in the understanding of basic processes in atomic interactions, and will be of use in such practical problems as controlling high-temperature plasmas and modelling naturally-occurring phenomena.

建议继续进行0.1 ~ 3.0 MeV离子与原子碰撞激发重原子内层电子壳层的综合实验研究。这项研究将揭示曲线交叉和其他发生在小核间分离的准分子现象。这项研究有两种散射设备：第一种是在目前的NSF资助期间完成的，用于探测俄歇电子或特征x射线，这些电子或特征x射线与离子在与气体目标的单次碰撞中散射成2到20度的角度。用这种装置获得的俄歇电子-离子重合谱的性质令人惊讶，本建议的主要目的将是继续这项新的努力。所获得的数据在性质上是不同的，并提供了关于不寻常的原子和分子状态的激发和衰变的独特和详细的信息。第二个装置是高分辨率x射线光谱仪，将用于研究与上述俄歇衰变相对应的辐射衰变。这些工作将辅以狄拉克-福克程序的计算。这三项工作的总和将为离子束与物质的相互作用提供新的和独特的信息。这项研究的结果将有助于理解原子相互作用的基本过程，并将在诸如控制高温等离子体和模拟自然现象等实际问题中使用。