SITE-SPECIFIC AND STATE-SELECTIVE PHOTOFRAGMENTATION OF MOLECULAR-OXYGEN ON SI(111)-(7X7)

被引:55
作者
DUJARDIN, G [1 ]
COMTET, G [1 ]
HELLNER, L [1 ]
HIRAYAMA, T [1 ]
ROSE, M [1 ]
PHILIPPE, L [1 ]
BESNARDRAMAGE, MJ [1 ]
机构
[1] UNIV PARIS 11, CNRS, PHOTOPHYS MOLEC LAB, F-91405 ORSAY, FRANCE
关键词
D O I
10.1103/PhysRevLett.73.1727
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
Molecular oxygen chemisorbed at room temperature on Si(111)-(7 X 7) exhibits a molecular adsorption site which is unexpectedly long lived. Photofragmentation from this specific O-2 adsorption site is studied by correlating the time decay of the corresponding molecular surface state observed in photoemission with the time decay of O+ desorbed photofragments. Photofragmentation occurs via direct nonresonant O2/Si(2 sigma g(-1)) and resonant O-2/Si (2p --> 3 sigma(u) electronic transitions. State selectivity of the photofragmentation is demonstrated by translational energy measurements of the O+ desorbed fragments.
引用
收藏
页码:1727 / 1730
页数:4
相关论文
共 21 条
  • [11] VIBRATIONAL STUDY OF THE INITIAL-STAGES OF THE OXIDATION OF SI(111) AND SI(100) SURFACES
    IBACH, H
    BRUCHMANN, HD
    WAGNER, H
    [J]. APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING, 1982, 29 (03): : 113 - 124
  • [12] A PHOTOELECTRON-SPECTROSCOPY AND PHOTON STIMULATED DESORPTION STUDY OF H2O ON SI(100)2X1
    LARSSON, CUS
    FLODSTROM, AS
    NYHOLM, R
    INCOCCIA, L
    SENF, F
    [J]. JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A-VACUUM SURFACES AND FILMS, 1987, 5 (06): : 3321 - 3324
  • [13] ORIGIN OF THE X-RAY-ABSORPTION FINE-STRUCTURE IN PHOTON-STIMULATED ION DESORPTION FROM SI-ADSORBATE SYSTEMS
    MCGRATH, R
    MCGOVERN, IT
    WARBURTON, DR
    PURDIE, D
    MURYN, CA
    PRAKASH, NS
    WINCOTT, PL
    THORNTON, G
    LAW, DSL
    NORMAN, D
    [J]. PHYSICAL REVIEW B, 1992, 45 (16): : 9327 - 9338
  • [14] INITIAL-STAGES OF OXYGEN-ADSORPTION ON SI(111) - THE STABLE STATE
    MORGEN, P
    HOFER, U
    WURTH, W
    UMBACH, E
    [J]. PHYSICAL REVIEW B, 1989, 39 (06): : 3720 - 3734
  • [15] ORIGIN OF SURFACE-STATES ON SI(111)(7X7)
    NORTHRUP, JE
    [J]. PHYSICAL REVIEW LETTERS, 1986, 57 (01) : 154 - 157
  • [16] SINGLE PHOTON DOUBLE IONIZATION OF THE OXYGEN MOLECULE
    PRICE, SD
    ELAND, JHD
    [J]. JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS, 1991, 24 (20) : 4379 - 4389
  • [17] THE BONDING OF HYDROGEN ON WATER-DOSED SI(111)
    ROSENBERG, RA
    LOVE, PJ
    REHN, V
    OWEN, I
    THORNTON, G
    [J]. JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A-VACUUM SURFACES AND FILMS, 1986, 4 (03): : 1451 - 1454
  • [18] A THEORETICAL-STUDY OF THE INITIAL-STAGES OF SI(111)-7X7 OXIDATION .2. THE DISSOCIATED STATE AND FORMATION OF SIO4
    SCHUBERT, B
    AVOURIS, P
    HOFFMANN, R
    [J]. JOURNAL OF CHEMICAL PHYSICS, 1993, 98 (09) : 7606 - 7612
  • [19] A THEORETICAL-STUDY OF THE INITIAL-STAGES OF SI(111)-7X7 OXIDATION .1. THE MOLECULAR PRECURSOR
    SCHUBERT, B
    AVOURIS, P
    HOFFMANN, R
    [J]. JOURNAL OF CHEMICAL PHYSICS, 1993, 98 (09) : 7593 - 7605
  • [20] PHOTON-STIMULATED DESORPTION OF FLUORINE FROM SILICON VIA SUBSTRATE CORE EXCITATIONS
    YARMOFF, JA
    JOYCE, SA
    [J]. PHYSICAL REVIEW B, 1989, 40 (05): : 3143 - 3150