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Work function of MgO single crystals from ion-induced secondary electron emission coefficient

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8 Author(s)
Lim, Jae Yong ; Charged Particle Beam and Plasma Laboratory/PDP Research Center, Department of Electrophysics, Kwangwoon University, Seoul 139-701, Korea ; Oh, Jun Soek ; Ko, Byung Doc ; Won Cho, Jae
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The work functions Φω of MgO single crystals with its respective orientation (111), (200), and (220) have been investigated from their ion-induced secondary electron emission coefficient γ, respectively, using various ions with different ionization energies in a γ-focused ion beam system. The work function Φω for MgO single crystal with (111) orientation has the lowest value, 4.22 eV, whereas it is 4.94 eV for (200) and the highest value is 5.07 eV for (220). These work functions of MgO single crystals can explain the nonzero values of the ion-induced secondary electron emission coefficient γ for Xe+ ions, whose ionization energy is 12.13 eV. © 2003 American Institute of Physics.

Published in:

Journal of Applied Physics  (Volume:94 ,  Issue: 1 )