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

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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.