DEVELOPMENT OF HIGH QUALITY MOLECULAR BEAM BEND ACTIVE CONTROL OF INTERFACIAL PHYSICAL CHEMICAL PHENOMENA

为了研制高质量的分子束和主动控制界面物理化学现象，着重研究了以下几个问题。(1)超声速自由射流分析将平板插入超声速自由射流中，通过数值模拟和真空实验研究平板-气体边界的物理化学现象。首先，利用我们的稀薄气体流数值预报器，估计了自由射流中气体分子的旋转状态。其次，通过改变平板的相对位置、初始气体压力、初始气体温度，利用电子束荧光（EBF）技术进行了真空实验。实验研究了旋转对界面现象的影响。(2)高质量分子束的设计和开发基于从（1）获得的知识，使用撇除器、准直器和孔径来估计分子束的流速、平移温度和旋转温度。因此，通过改变撇渣器的直径、形状和材料来优化分子束。此外，喷嘴与一维横向单元相结合，以提取自由射流的可选区域。对真空系统和滤质器进行了改进，采用了脉冲喷嘴。这种变化为我们提供了高质量的数据。测试气体分子为Ar和He，测试表面为石墨和铜，以获得分子尺寸与其三维散射数据之间关系的数据。

The following topics were mainly emphasized for the development of a high quality molecular beam and the active control of interfacial physical chemical phenomena.(1) Analysis of the supersonic free jetA flat plate was inserted into the supersonic free jet and numerical simulations and vacuum experiments were carried out to understand the interfacial physical chemical phenomena at the plate-gas boundary. First, using our rarefied gas now numerical predictor, the rotational state of the gas molecules inside the free jet was estimated. Next, vacuum experiments using the electron beam fluorescence (EBF) technique was performed by changing the plate's relative position, initial gas pressure, initial gas temperature. Experiments were done to investigate the rotational effect on the interfacial phenomena.(2) Design and development of a high quality molecular beamBased on the knowledge obtained from (1), flow velocity, translational temperature and rotational temperature of a molecular beam using a skimmer, collimator, and an aperture was estimated. Thus, the molecular beam was optimized by changing the skimmer diameter, shape and material. Also, the nozzle was combined with a one-dimensional traverse unit to extract an optional region of the free jet. Furthermore, the vacuum system and mass filter were revised, and a pulsed nozzle was adopted. Such change has given us high quality data. The test gas molecules were Ar and He, the test surfaces were graphite and copper, to obtain data on the relation between molecular size and it's three-dimensional scattering data.