Abstract
Several ordered atomic overlayers, c(2 × 2)-C, c(2 × 2)-N, p(1 × 1)-O, c(2 × 2)-C,O, and c(2 × 2)-S on the Fe(100) surface, have been prepared and studied by High Resolution Electron Energy Loss Spectroscopy (HREELS). The following vibrational peaks were observed: a peak at 520 cm −1 for c(2 × 2)-C, a peak at 490 cm −1 for c(2 × 2)-N, two peaks at 280 cm −1 and 430 cm −1 for p(1 × 1)-O, two peaks at 395 cm −1 and 515 cm −1 for c(2 × 2)-C,O and a peak at 270 cm −1 for c(2 × 2)-S. The metal-atom stretching frequencies are ordered as ṽ Fe-C > ṽ Fe-N > ṽ Fe-O on the Fe(100) surface. Differences between these observations and previous measurements on the Fe(111) surface are discussed.
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