五、作为催化反应的研究手段催化过程包括吸附、扩散、反应、脱附等,运用分子束表面散射可从分子水平来研究其动力学过程、能量交换过程及几何结构因子对催化过程的影响等。 1.分析方法催化动力学的信息是通过测量气相反应物、吸附中间物及气相反应产物浓度随时间变化的关系得到的。通常采用分子束张弛谱技术,由四极质谱计与锁相放大器测得的反应产物信号的振幅及其相对于入射信号的相移作为调制频率,或表面温度的函数来进行分析。分析的步骤如下:1)建议一个反应机制,并写出相应的中间物、产物浓度的动力学方程;2)用近似边界条件解此与时间有关的微分方程,得到与时 Fifth, as a catalyst for the catalytic research of the catalytic process, including adsorption, diffusion, reaction, desorption and so on, the use of molecular beam surface scattering can be molecular level to study its kinetic process, the energy exchange process and geometric factors on the catalytic process . 1. Analytical Methods The information on catalytic kinetics is obtained by measuring the relationship between gas phase reactant, adsorbent intermediates, and gas phase reaction product concentration over time. The molecular beam relaxation technique is typically used to analyze the amplitude of the reaction product signal measured by the quadrupole mass spectrometer and the lock-in amplifier and its phase shift relative to the incident signal as a function of the modulation frequency or surface temperature. The steps of analysis are as follows: 1) Propose a reaction mechanism and write the corresponding kinetic equations of intermediate and product concentration; 2) Solve this time-dependent differential equation by approximate boundary conditions