摘要
当Fe蒸发到Cu（110）面上，可观察到两种不同的有序结构，在一个单层Fe覆盖度时，可以得到清楚的（1×1）LEED图像；当Fe的覆盖度增大到两个单层，并在200℃保持10min后，可以观察到（6×1）LEED图像。ARAES的结果表明，（6×1）LEED的结构不是由于Fe原于向体内扩散或是Cu原于向表面偏析，而是由于每6个表面Fe原子沿（100）晶向的微小收缩。ARUPS的结果表明，当CU（110）表面沉积Fe后，在费米能级附近杂化后的Cu4s信号强度增加，在Cu3d带附近没有观察到新的电子态。
Two ordered structures were obtained by vapor-deposition of Fe atoms onto Cu (110). One showed a clear (1×1) LEED pattern when 1 ML of Fe atoms was deposited. The other showed a (6×1) su- perstructure when 2 ML of the Fe atoms were deposited and followed by annealing at 200℃ for 10 min. ARAES results on this ordered structure show that this pattern is caused by a slight contraction of Fe atoms along (001) azimuth and with the same layer spacing as a truncated bulk Cu. ARUPS shows an increasing in- tensity near the Fermi level and no new electronic states at the level of Cu 3d band on the Fe covered Cu (110) ordered surface.
出处
《真空科学与技术》
CSCD
1995年第3期167-171,共5页
Vacuum Science and Technology
基金
国家自然科学基金
