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.
引用
收藏
页码：4797 / 4800
页数：4
相关论文
共 33 条
[1]   PROBING AND INDUCING SURFACE-CHEMISTRY WITH THE STM - THE REACTIONS OF SI(111)-7X7 WITH H2O AND O2 [J].
AVOURIS, P ;
LYO, IW .
SURFACE SCIENCE, 1991, 242 (1-3) :1-11
[2]   ATOM-RESOLVED SURFACE-CHEMISTRY - THE EARLY STEPS OF SI(111)-7X7 OXIDATION [J].
AVOURIS, P ;
LYO, IW ;
BOZSO, F .
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B, 1991, 9 (02) :424-430
[3]   MANY-BODY NATURE OF THE MEYER-NELDEL COMPENSATION LAW FOR DIFFUSION [J].
BOISVERT, G ;
LEWIS, LJ ;
YELON, A .
PHYSICAL REVIEW LETTERS, 1995, 75 (03) :469-472
[4]   THERMAL AND PHOTOCHEMICAL OXIDATION OF SI(111) - DOPING EFFECT AND THE REACTION-MECHANISM [J].
BOZSO, F ;
AVOURIS, P .
PHYSICAL REVIEW B, 1991, 44 (16) :9129-9132
[5]   KINETICS OF OXYGEN DISSOCIATION ON SI(111)7X7 INVESTIGATED WITH OPTICAL 2ND-HARMONIC GENERATION [J].
BRATU, P ;
KOMPA, KL ;
HOFER, U .
PHYSICAL REVIEW B, 1994, 49 (19) :14070-14073
[6]   OBSERVATION OF 2 LONG-LIVED MOLECULAR-STATES OF O-2 ON SI(111)7X7 AT ROOM-TEMPERATURE [J].
COMTET, G ;
DUJARDIN, G ;
HELLNER, L ;
HIRAYAMA, T ;
ROSE, M ;
PHILIPPE, L ;
BESNARDRAMAGE, MJ .
SURFACE SCIENCE, 1995, 331 :370-374
[7]   Adsorption of O-2 on Si(111)7x7 compared at 300 and 30K [J].
Comtet, G ;
Hellner, L ;
Dujardin, G ;
Ramage, MJ .
SURFACE SCIENCE, 1996, 352 :315-321
[8]   SITE-SPECIFIC AND STATE-SELECTIVE PHOTOFRAGMENTATION OF MOLECULAR-OXYGEN ON SI(111)-(7X7) [J].
DUJARDIN, G ;
COMTET, G ;
HELLNER, L ;
HIRAYAMA, T ;
ROSE, M ;
PHILIPPE, L ;
BESNARDRAMAGE, MJ .
PHYSICAL REVIEW LETTERS, 1994, 73 (12) :1727-1730
[9]   New model of the initial stages of Si(111)-(7x7) oxidation [J].
Dujardin, G ;
Mayne, A ;
Comtet, G ;
Hellner, L ;
Jamet, M ;
LeGoff, E ;
Millet, P .
PHYSICAL REVIEW LETTERS, 1996, 76 (20) :3782-3785
[10]   OXIDATION OF THE SI(111) (7X7) SURFACE - ELECTRON-ENERGY LOSS SPECTROSCOPY, LOW-ENERGY ELECTRON-DIFFRACTION, AND AUGER-ELECTRON SPECTROSCOPY STUDIES [J].
EDAMOTO, K ;
KUBOTA, Y ;
KOBAYASHI, H ;
ONCHI, M ;
NISHIJIMA, M .
JOURNAL OF CHEMICAL PHYSICS, 1985, 83 (01) :428-436
1234