An advanced molecular-beam surface-scattering apparatus for studies under extreme conditions

用于极端条件下研究的先进分子束表面散射装置

• 批准号: 210150221
• 金额: --
• 依托单位: Georg-August-Universität Göttingen
• 依托单位国家: 德国
• 项目类别: Major Research Instrumentation
• 财政年份: 2011
• 资助国家: 德国
• 起止时间: 2010-12-31 至 无数据
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/210150221?language=en
• 关键词: advanced; molecular; beam; surface; scattering

We propose an advanced molecular-beam surface-scattering apparatus optimzed for studies under extreme conditions. This instrument goes well beyond the capabilities of our existing machine with regard to the following parameters: 1) accessability of extreme surface temperatures and extreme incidence energies, 2) product detection by optical methods (REMPI; soft VUV photoionization) as well as electron impact ionization mass spectrometry, 3) dual molecular beam geometry for reactive scattering, and 4) interfacing with an existing nanoparticle soft-landing apparatus. The new instrument will extend our understanding of Born Oppenheimer breakdown as it will enable studies where large amounts of energy (high temperature, high translational energy) are exchanged between a molecule and the surface. New types of reactions (e.g. surface ionization by proton transfer) are also possible. Studies on reactive scattering will elucidate the importance of nonadiabatic influence in chemical reactions, i.e. show how the energy flow between the electronic and nuclear (vibrational) degrees of freedom suppresses or enhances chemical reactions. Conversion of chemical to optical energy – a so far unobserved channel – will be studied using surface-coupled quantum well structures.

我们提出了一种先进的分子束表面散射装置优化极端条件下的研究。该仪器在以下参数方面远远超出了我们现有机器的能力：1）极端表面温度和极端入射能量的可访问性，2）通过光学方法进行产品检测（REMPI;软VUV光电离）以及电子碰撞电离质谱，3）用于反应散射的双分子束几何结构，和4）与现有的纳米颗粒软着陆装置接口。新仪器将扩展我们对Born Oppenheimer击穿的理解，因为它将使大量能量（高温，高平移能量）在分子和表面之间交换的研究成为可能。新类型的反应（例如通过质子转移的表面电离）也是可能的。对反应散射的研究将阐明非绝热影响在化学反应中的重要性，即显示电子和核（振动）自由度之间的能量流如何抑制或增强化学反应。将利用表面耦合量子阱结构来研究化学能到光能的转换--这是一个迄今为止尚未观察到的通道。