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In this paper, a scalene triangle-dimer-adatom model of the Si(lll)7×7 surface determined from band theory calculation of Low-Energ electron diffraction is prensented. We found the first-layer spacing distance d1 = 0.95±0.02?(expanded 21.3%±0.02?), the second-layer spacing distance d2=0.83±0.02?(expanded 5.9%±0.02?), the third-layer spacing distance d3 = 0.69±0.05?(contracted 10.9%±0.05?) and the fourth-layer spacing distance d4 = 2.38±0.08? (expanded 3.8%±0.08?).
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