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Study on the Interaction of Polarized Atomic Hydrogen Beam with Solid Surfaces

偏振原子氢束与固体表面相互作用的研究

基本信息

批准号：
60420021
负责人：
OKANO Tatsuo
金额：
$ 20.16万
依托单位：
Institute of Industrial Science, University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (A)
财政年份：
1985
资助国家：
日本
起止时间：
1985 至 1988
项目状态：
已结题

项目摘要

Main subject of this project is the development and application of novel experimental techniques for the study of magnetic interaction of atoms and molecules with solid surfaces. The techniques developed in the project is divided into following three items.1. Atomic beam scattering of polarized atomic hydrogen The generation of high intensity atomic hydrogen beam and the detection of scattered atomic hydrogen were studied. Atomic hydrogen was evolved in a RF discharge-tube and the selection of its spin state was made by using a hexapole magnet. To keep the focusing of atomic hydrogen constant irrespective to its energy, we have developed a linear translator of the magnet system. The detection of atomic hydrogen was made by using a thermistor device. The operating condition and its limitation were studied. A preliminary measurement of reactive scattering of atomic hydrogen with a graphite surface was made at several temperatures.2. Measurement of the polarization of adsorbed atomic hydrogen To apply the beam-foil spectroscopy to the measurement of the poralization of adsorbed atoms, we have studied the ionization process of adsorbed atoms under irradiation of intense pulse laser. A method for the evaluation of the absolute intensity of ionized atoms was newly developed and was named "conductance modulation method".3. Measurement of ortho-para conversion of adsorbed hydrogen molecule. The rotational excitation of hydrogen was measured by using low-energy electron loss spectroscopy. The conversion rate was measured for several sufaces as follows: Ag(111), Xe/Ag(111), O^2/Ag(111).

该项目的主要课题是开发和应用新的实验技术来研究原子和分子与固体表面的磁相互作用。本项目开发的技术分为以下三项： 1．偏振原子氢的原子束散射研究了高强度原子氢束的产生和散射原子氢的检测。氢原子在射频放电管中产生，并通过使用六极磁铁来选择其自旋状态。为了保持原子氢的聚焦恒定，无论其能量如何，我们开发了磁体系统的线性平移器。原子氢的检测是通过使用热敏电阻装置进行的。研究了其运行条件及其局限性。在不同温度下对原子氢与石墨表面的反应散射进行了初步测量。 2．吸附原子氢偏振度的测量为了将束箔光谱应用于吸附原子偏振度的测量，我们研究了强脉冲激光照射下吸附原子的电离过程。新发展了一种评价电离原子绝对强度的方法，命名为“电导调制法”。 3．吸附氢分子邻位-对位转化的测量。通过使用低能电子损失光谱测量氢的旋转激发。测量了几个表面的转化率，如下所示：Ag(111)、Xe/Ag(111)、O^2/Ag(111)。