| Project/Area Number |
07554060
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 試験 |
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| Research Field |
Physical chemistry
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| Research Institution | KYOTO UNIVERSITY |
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Principal Investigator |
ARUGA Tetsuya Kyoto University, Graduate School of Science, Associate Professor, 大学院・理学研究科, 助教授 (70184299)
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| Co-Investigator(Kenkyū-buntansha) |
TAKAGI Noriaki Kyoto University, Graduate School of Science, Research Associate, 大学院・理学研究科, 助手 (50252416)
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| Project Period (FY) |
1995 – 1996
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| Project Status |
Completed (Fiscal Year 1996)
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| Budget Amount *help |
¥1,400,000 (Direct Cost: ¥1,400,000)
Fiscal Year 1996: ¥1,400,000 (Direct Cost: ¥1,400,000)
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| Keywords | scanned probe microscope / scanning tunneling microscope / surface chemistry / coadsorption / パラジウム / 表面 / 吸着 / STM |
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| Research Abstract |
We have developped a new variable-temperature sanned probe microscope in order to study the dynamics of individual surface atoms and mesoscopic clusters under non-equillibrium conditions. In order to study further on the surface dynamics, we have also conducted thermal desorpition and high-resolution electron energy loss spectroscopy to investigate the ordering in the (NO+CO) coadsorption system on the Pd (100) surface and the energy-transfer dynamisc in the H+H/Pd (100) system.
The scanned probe microscope developped in the present study can be operated under ultrahigh vacuum and at sample temperature from 100 to 1000K.Another important characteristic is its low-noise signal output. The vertical noise for the topographic imaging mode is 3 pm (p-p), which enables the imaging of (100) and (111) surfaces of transition metals. This microscope can also be operated at tunneling current aslow as 1 pA,which enables imaging of low-conductivity materials such as organic crystals.
The ordering in (NO+CO) /Pd/ (100) coadsorption system has been studied by low-energy electron diffraction, thermal desorption and vibrational spectroscopy preparatory to the application of the scanned probe microscope. We have found that NO and CO from stable mixed ordered phases and that an explosive CO2 formation reaction undergoes in the mixed ordered phases. A kinetic Monte Carlo simulation based on a lattice-gas model has been done to quantify NO-CO intermolecular interactions. It was found that the additivity holds for the attractive interaction among NO and CO.
We are planning to use the scanned probe microscope to investigate the microscopic mechanism of ordering at surfaces.
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