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

使用激光爆炸和 STM 观察控制表面反应

• 批准号: 16350002
• 负责人: TAKAOKA Tsuyoshi
• 金额: $ 9.02万
• 依托单位: Tohoku University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2004
• 资助国家: 日本
• 起止时间: 2004 至 2005
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-16350002/
• 关键词: surface; molecular beam; Laser; STM; FTIR; chemical reaction; catalysis; oxidation

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.

本课题的研究对象是利用激光爆轰技术制备的高速原子分子束进行化学反应控制。实验需要气体原子和分子的入口、激光爆轰装置、观察表面反应的STM装置和超高真空室。其中，研制了激光爆轰装置和扫描隧道显微镜.激光爆轰装置激光爆轰装置由激光源、调整激光方向的反射镜、聚焦激光的聚焦镜、带喷嘴的气体容器、引导气体的管道组成。原子和分子的平移能量是从激光放电和分子到达质谱仪的时间之间的时间差来测量的。开发了定时控制系统，用于测量分子到达质谱仪的时间.利用扫描隧道显微镜（STM）观察了高速分子辐照样品表面后表面分子的种类、结构和位置。高速分子入射的位置与STM区域应重叠，以观察分子照射样品表面后的STM图像。所以，我们想出了一些主意。此外，在STM系统中起着重要作用的压电元件也容易受到振动噪声的影响。然而，水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。

项目成果

Ammonia adsorption on and diffusion into thin ice films grown on Pt(111).

氨吸附并扩散到 Pt(111) 上生长的薄冰膜中。

• 发表时间: 2004
• 期刊: J. Chem. Phys. 121
• 作者: T.Amano;T.Hirao;T.Takaoka
• 通讯作者: T.Takaoka