Study and control of Rydberg-molecule interactions with surfaces and adsorbates

里德伯分子与表面和吸附物相互作用的研究和控制

基本信息

批准号：
EP/E027636/1
负责人：
Tim Softley
金额：
$ 109.5万
依托单位：
University of Oxford
依托单位国家：
英国
项目类别：
Research Grant
财政年份：
2007
资助国家：
英国
起止时间：
2007 至无数据
项目状态：
已结题

来源：
https://gtr.ukri.org/projects?ref=EP%2FE027636%2F1
关键词：
Study control Rydberg molecule interactions

项目摘要

When a molecule absorbs deep ultraviolet radiation it may exist transiently as a Rydberg state in which one of the electrons has been promoted into a high-energy orbit at a long distance from the core of the molecule. In such states, molecules have exotic properties because the excited Rydberg electron is very easily perturbed by external electric or magnetic fields and by interactions with other molecules. This proposal is concerned with the investigation of the novel chemistry and physics that occurs when these Rydberg molecules, created by laser excitation in the gas phase, bump into a solid surface. In broad terms, collisions between molecules in the gas phase and solid surfaces are of importance in a wide range of chemical processes ranging from catalysis, to corrosion, to electronic device technology to the formation of the ozone hole in the stratosphere. One type of gas phase environment, known as a plasma , is made up of a mixture of charged (ionized) species, highly reactive free radicals, and electronically-excited energy-rich species including Rydberg atoms and molecules. The process of plasma deposition is of major importance in the electronics industry and the interaction between the gas-phase plasma and solid surfaces lies at the heart of this process. The role of Rydberg atoms and molecules in plasmas is poorly understood. In the work proposed here, we aim to understand at a fundamental level the interaction between the metastable Rydberg molecules and well-defined surfaces. We will target a beam of molecules, which have been laser excited into Rydberg states, at a well defined and characterised surface and study the processes that occur. These will include: ionization of the impacting molecules by electron transfer to the surface; dissociation of the incoming molecules via chemical bond breaking; deposition of the energy of the Rydberg electron into the surface to break bonds and initiate chemical processes of adsorbates bonded to the surface. We will investigate whether it is possible to control the propensities for these processes using applied electric fields. The orbit of the Rydberg electron can be severely distorted by such fields and this affects the subsequent chemical behaviour and may have a profound effect on its interaction with the surface.

当分子吸收深紫外辐射时，它可能会瞬时存在为rydberg状态，其中一个电子被促进到距离分子核心很长一段距离的高能轨道中。在这种状态下，分子具有外在特性，因为激发的rydberg电子很容易被外部电场或磁场扰动，并与其他分子相互作用。该提议涉及对这些新的化学和物理物质的研究，这些新的化学和物理学是当这些rydberg分子在气相中激发激发产生的，撞到固体表面时。从广义上讲，气相和固体表面之间的碰撞在从催化，腐蚀到电子设备技术到平流层中臭氧孔的形成等广泛的化学过程中至关重要。一种类型的气相环境，称为血浆，由带电（电离）物种的混合物，高反应性的自由基以及包括Rydberg原子和分子在内的电子激发的能量富含能量的物种组成。等离子体沉积的过程在电子行业中至关重要，气相等离子体和固体表面之间的相互作用是该过程的核心。 Rydberg原子和分子在等离子体中的作用知之甚少。在此处提出的工作中，我们旨在在基本水平上了解亚稳态Rydberg分子与明确定义明确的表面之间的相互作用。我们将瞄准一束分子，这些分子是在定义明确和表征的表面上激发到rydberg状态的激光，并研究发生的过程。这些将包括：通过电子转移到表面的电离分子的电离；通过化学键断裂的传入分子解离；将Rydberg电子能量沉积到表面中，以打破键并启动与表面键合的吸附物的化学过程。我们将研究是否有可能使用应用的电场来控制这些过程的倾向。 Rydberg电子的轨道可能会因此类场而严重扭曲，这会影响随后的化学行为，并可能对其与表面的相互作用产生深远的影响。