Site hopping of single chemisorbed oxygen molecules on Si(111)-(7x7) surfaces

被引：70
作者：
Hwang, IS
Lo, RL
Tsong, TT
机构：
[1] Institute of Physics, Academia Sinica, Taipei, Nankang
来源：
PHYSICAL REVIEW LETTERS | 1997年 / 78卷 / 25期
关键词：
D O I：
10.1103/PhysRevLett.78.4797
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We observe directly the site hopping motion of a molecular O-2 species on Si(111)-(7 x 7) surfaces using a variable-temperature scanning tunneling microscopy. At the temperature range of our observation, the hopping is mainly confined to one-half of the 7 x 7 unit cell between adjacent 7 x 7 adatom sites. Through Arrhenius plots, the activation energies for the hopping between different atomic sites are derived. We also resolve two short-lived intermediate states which mediate the site hopping. An atomic mechanism is proposed to explain the molecular hopping process.
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页码：4797 / 4800
页数：4
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