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| Study of Displacement Adsorption of N2 by O2 on Surface of Polycrystalline W via Threshold Energy of Electron-stimulated Desorption |
| Zhang Tong;Wu Qiang;Hu An;Mao Fu-Ming;Yang Xue-Qian |
| Electronic Engineering Department, Southeast University, Nanjing 210096; National Laboratory of Solid State Microstructures and Physics Department, Nanjing University, Nanjing 210093; School of Mathematics ＆ Computer Science, Nanjing Normal University, Nanjing 210097 |
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Abstract The threshold energies of electron-stimulated desorption of N2 and O2 from polycrystalline W in vacuum (1×10－3 Pa) at T=300 K are measured. For O2-W couple, the threshold energy is about 15.5 eV; For N2-W couple, the threshold energy is about 13.8 eV. The displacement adsorption of N2 by O2 from the surface of polycrystalline W is studied using the measured threshold energy. The result shows that within a given time interval, N2 could be displaced by O2 on the surface of W, but the opposite process could not occur.
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Received: 25 November 2002
Published: 15 August 2003
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Corresponding Authors:
Zhang Tong
E-mail: njutonnyz@sina.com
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