| Project/Area Number |
17550011
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Physical chemistry
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| Research Institution | Osaka University |
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Principal Investigator |
OKADA Michio Osaka University, Graduate School of Science, Associate Professor (30281116)
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| Project Period (FY) |
2005 – 2007
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| Project Status |
Completed (Fiscal Year 2007)
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| Budget Amount *help |
¥3,750,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥150,000)
Fiscal Year 2007: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2006: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 2005: ¥2,100,000 (Direct Cost: ¥2,100,000)
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| Keywords | Physics of Surfaces and Interfaces / Atomic and Molecular Physics / Catalytic and Chemical Processes |
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| Research Abstract |
One of the ultimate goals of surface science is to be able to design surfaces with particular catalytic reactivity. This entails a need for an atomic-level understanding of the fundamental principles (elementary processes) underlying the bond-making and bond-breaking at surfaces. The orientation of a molecule incoming on the surface is expected to play an important role in such elementary processes. We have been developing a new machine of ultra-high-vacuum (UHV) compatible oriented-molecular beam line, in order to investigate for initial orientation-effect of an incoming molecule in the surface chemical reactions. The purpose of the present research project is to probe the surface-chemical reaction, especially on Si surfaces, in detail by controlling the molecular orientation of impinging molecules. We report results of a study on the incident-energy and the surface-temperature dependence of the steric effects in the dissociative adsorption of CH_3Cl on a Si(100) surface. The initial sticking probability of CH_3Cl on Si(100) was measured by the King-Wells method. Data presented show that the initial sticking probability for the Cl-end collision is larger at an incident energy of 120 meV than that in the CH_3-end collision. Furthermore, this steric preference is quite sensitive to the kinetic energy and the rotational state of CH_3Cl and the surface temperature. This study shows that the non-equilibrium surface trapping plays a key role in the initial step of the decomposition of CH_3Cl on Si(100). We also introduce the on-going experiments using another new apparatus equipped with the oriented-molecular beam line and the reaction chamber for X-ray photo-emission spectroscopy. In the reaction of oriented NO molecules with Si(111), we found that a N-end collision is more effective in the dissociative adsorption than O-end collision. In addition, we also elucidate the oxide-formation processes on Cu surfaces with oxygen molecular beam.
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