摘要
分子束—表面散射技术是研究气体—表面相互作用动力学的有力工具.它的主要突破在于从分子(原子)量度来揭示诸如催化、腐蚀、吸附,脱附和能量适应等宏观的气体—表面作用过程.它同时也是一种表面分析的工具. 本文概述了本实验室研制的一台分子束—表面散射装置的总体设计(包括分子束源、调制室、分析室、真空系统及测试系统等的设计),接着评述已建成的该装置的性能及实验技术(包括束强度、束速度及束截面的测量,分子束张弛谱、束平动能的改变、沾着几率的测量及表面吸附物的化学态分析等),最后举例说明本装置的应用.
Molecular beam-surface scattering technique is a powerful tool for investigating kinetics and dynamics of gas-surface interactions. Its main thrust is to explore on molecular (atomic) scale such macroscopic gas-surface processes as catalysis, corrosion, adsorption, desorption and energy accomodation. It also provides a tool for surface analysis.The total design (including designs of molecular beam source, modulation chamber, analytic chamber, vacuum system and detecting system) for a molecular beamsurface scattering apparatus in our laboratory is outlined. Then the basic characteristics of this apparatus and experimental techniques (including measurement of beam intensity, beam velocity and cross-section of the beam, molecular beam relaxation spectrometry, variations of translational kinetic energy of the beam, measurement of initial sticking probability and analysis of chemical states of adsorbates on the surface) are reviewed. Finally some examples for applying this apparatus are given.
