Seminars & Lectures
| * TITLE | Structure and dynamics of NO molecules on MgO(100) surface | ||||||
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| * DATE / TIME | 2003-04-16, 3:00 pm | ||||||
| * PLACE | 포항공대 물리학과 2층 세미나실 | ||||||
| * ABSTRACT | |||||||
| Studies of dynamics and chemical reactions of molecules on a metal oxide surface are interesting because the interaction of molecules with the surface provides fundamental knowledge to understand the structural development from the two dimensional film to the three dimensional lattice. The results from this study are expected to enhance our understanding on the surface mediated chemical reactions that can subsequently be applied to the study of catalytic reactions aimed at reducing atmospheric pollutant. In this aspect, adsorption properties of nitrogen and sulfur oxides, for example, that account for a significant fraction of atmospheric pollutants are particularly important. A combined thermodynamic and structural investigation of the interaction of nitric oxide (NO) on the MgO (100) surface was made. Adsorption isotherm studies recorded below the triple point (109.51K) showed the formation of at least two distinct layers of NO in the temperature range above 85K. By comparing these measurements with those of methane on MgO (where the specific adsorption area is known), an area of NO molecule that occupies in the monolayer phase can be calculated (10.3?2). Synchrotron x-ray diffraction (XRD) data were also recorded from a monolayer film of NO on MgO (100) for a series of different temperatures at the X7B beam line of the National Synchrotron Light Source of BNL. The difference spectra between monolayer and no NO coverage show a “sawtooth shaped” peak at 2.1 ?-1 in Q suggesting that NO forms a 1´1 commensurate solid on the MgO (100) surface. |
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