Surface reaction control by the use of Laser detonation and STM observation

本研究的目的是利用激光爆轰技术制备的原子和分子的高速光束来控制化学反应。进行实验需要气体原子分子入口、激光爆震装置、观察表面反应的STM装置和超高压室。其中，研制了激光起爆装置和STM。激光起爆装置激光起爆装置由激光源、调节激光方向的反射镜、聚焦激光的聚焦镜、带喷嘴的气体容器、引导气体通过的管道等组成。原子和分子的平动能是由激光放电和分子到达质谱仪的时间差来测量的。开发了定时控制系统，用于测量分子到达质谱仪的时间。用STM观察高速分子照射样品表面后分子的种类、结构和在表面的位置。高速分子入射位置与STM区域重叠，观察样品表面被高速分子照射后的STM图像。所以，我们想出了一些主意。此外，压电元件在STM系统中起着非常重要的作用，容易受到振动噪声的影响。然而，泵的噪音比我们预期的要大。所以我们想出了一些办法来抑制噪音。

The object of this research is the chemical reaction control by the use high-speed beam of atoms and molecules prepared with Laser detonation technique. To perform the experiment, inlet of gaseous atoms and molecules, Laser detonation apparatus, STM apparatus to observe the surface reaction, and UHV chamber are required. Among them, Laser detonation apparatus and STM were developed in the research.1. Laser detonation apparatusLaser detonation apparatus is composed of Laser source, mirrors to adjust the Laser direction, a focusing mirror to focus the Laser, gas vessel with a nozzle, pipes through which gases are led. The translational energy of atoms and molecules are measured from the time difference between Laser discharge and time of the arrival of the molecule at the mass spectrometer. Timing control system was developed to measure the time of the arrival of the molecule at the mass spectrometer.2. STMThe species, structure and position of the molecule on the surface after the sample surface is irradiated with high-speed molecules are observed with STM. Position where high-speed molecules are incident on and STM area should be overlapped to observe the STM image after the sample surface are irradiated with the molecules. So, we came up with some ideas. Moreover, piezoelectric parts, which play a very important role in STM system, are easily affected by vibrational noise. However, the noise from pumps is more than we expected. So we came up with some ideas to suppress the noise.