Secondary Ion Mass Spectrometry with Massive Projectiles

使用大型射弹进行二次离子质谱分析

• 批准号: 0750377
• 负责人: Emile Schweikert
• 金额: $ 55万
• 依托单位: Texas A&M Research Foundation
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2008
• 资助国家: 美国
• 起止时间: 2008-04-01 至 2011-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0750377&HistoricalAwards=false
• 关键词: Secondary; Ion; Mass; Spectrometry; Massive

Drs. Emile Schweikert, Stanislav Verkhoturov, and Richard Rickman of Texas A&M University are supported by the Analytical and Surface Chemistry Program with co-funding from the Office of International Science and Engineering to investigate the nature of the molecules and molecular fragments that are ejected when a surface is bombarded with energetic massive clusters. The latter are composed of hundreds of atoms of gold or bismuth and are accelerated prior to impact to hypersonic velocities. The purpose of the project is to identify the ionized ejecta from single massive projectile impacts and relate the observation to the nature and abundance of the chemical species originally present in the nanometric size volume perturbed by a projectile. This work combines the localization of a single projectile shot via electron emission microscopy, with the detection of the concurrent ionized emission via mass spectrometry. The data from a sequence of such impact emission events can be displayed as a chemical map showing the distribution of molecules with an anticipated sub-100nm lateral resolution. The development of mass spectrometry with extremely high spatial resolution will enhance "chemical vision" at a level where current capabilities are limited. Technology for chemical mapping with the sub-100nm resolution is critical for characterizing nanoparticles and mapping biological structures such as single cells. Members of the research team are thus exposed to a wide-range of interdisciplinary science.

Emile Schweikert博士，Stanislav Verkhoturov博士和德克萨斯州A M大学的Richard Rickman博士由分析和表面化学计划支持，由国际科学与工程办公室共同资助，以调查当表面被高能大质量团簇轰击时喷射的分子和分子碎片的性质。 后者由数百个金或铋原子组成，在撞击之前被加速到高超音速。 该项目的目的是确定单个大质量射弹撞击产生的电离喷出物，并将观测结果与最初存在于受射弹扰动的纳米尺寸体积中的化学物质的性质和丰度联系起来。 这项工作结合了通过电子发射显微镜定位一个单一的弹丸射击，通过质谱检测的并发电离发射。 来自一系列这样的撞击发射事件的数据可以显示为化学图，其显示了具有预期的亚100 nm横向分辨率的分子分布。具有极高空间分辨率的质谱仪的发展将在目前能力有限的水平上增强“化学视觉”。 具有低于100 nm分辨率的化学映射技术对于表征纳米颗粒和映射单细胞等生物结构至关重要。 因此，研究团队的成员接触到广泛的跨学科科学。