Manipulation of surface reaction using supersonic molecular beam

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The reaction of gas molecules on solid surfaces is very important as it is related with catalysis and production of semiconductor devices. The objects of our research are the elucidation of the relation between the reactions on surfaces and the energy of molecules colliding the surface, and the manipulation of surface reactions with the control of the energy of molecules. We observed the effects of translational energy of gas molecules on the reactions of adsorbates.We used supersonic molecular beam apparatus to control the translational energy of gas molecules, Fourier transformed infrared spectrometer to detect the surface reaction, mass spectrometer to detect the desorbed molecules from the surface. The Ni(100) surface exposed to hydrogen gas and carbon monoxide gas is irradiated with energy controlled Xe atoms. When Xe energy is 0.5 eV, FTIR spectra of the CO/H/Ni(100) surface is not changed. However, when Xe energy is 1.0 eV, adsorption state of CO of the CO/H/Ni(100) changes and a part of CO molecules are desorbed from the surface. This phenomena is explained as the change of adsorption site of CO induced by Xe collision. We could control the desorption reaction which is the most elementary step in surface reactions by controlling the energy of molecules. We would like to develop the control of surface reaction by using energy controlled gas molecules, based on the present results.