Theoretical and experimental study of positron annihilation with core electrons in solids

被引:256
作者
Alatalo, M
Barbiellini, B
Hakala, M
Kauppinen, H
Korhonen, T
Puska, MJ
Saarinen, K
Hautojarvi, P
Nieminen, RM
机构
[1] Laboratory of Physics, Helsinki University of Technology
关键词
D O I
10.1103/PhysRevB.54.2397
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
A theory for calculating the momentum distribution of annihilating positron-electron pairs in solids is presented. To test the theory, momentum distributions are measured by the Doppler broadening of the annihilation radiation for several bulk metals and semiconductors, as well as for semiconductor alloys acid for positrons trapped at vacancies in semiconductors. The theory is based on a two-particle description of the annihilating electron-positron pair. Then, the electron-positron correlation effects, i.e., the enhancement of the electron density at the positron, depend on the electronic state in question. The theory is suited for calculating the high-momentum part of the annihilation spectrum that arises from the core electrons and which can be measured by the Doppler broadening using coincidence techniques. The ideas of the theory are justified by a good agreement between theory and experiment in the case of positron annihilation in undefected bulk lattices. Moreover, the comparison of the theoretical and experimental spectra for alloys and vacancy defects tests the theoretical description for the positron distribution in delocalized and localized states, respectively.
引用
收藏
页码:2397 / 2409
页数:13
相关论文
共 46 条
  • [1] POSITRON-ANNIHILATION AT PARAMAGNETIC DEFECTS IN SEMICONDUCTORS
    ALATALO, M
    PUSKA, MJ
    NIEMINEN, RM
    [J]. JOURNAL OF PHYSICS-CONDENSED MATTER, 1993, 5 (22) : L307 - L314
  • [2] IDENTIFICATION OF VACANCY DEFECTS IN COMPOUND SEMICONDUCTORS BY CORE-ELECTRON ANNIHILATION - APPLICATION TO INP
    ALATALO, M
    KAUPPINEN, H
    SAARINEN, K
    PUSKA, MJ
    MAKINEN, J
    HAUTOJARVI, P
    NIEMINEN, RM
    [J]. PHYSICAL REVIEW B, 1995, 51 (07): : 4176 - 4185
  • [3] PHOSPHORUS VACANCY IN INP - A NEGATIVE-U CENTER
    ALATALO, M
    NIEMINEN, RM
    PUSKA, MJ
    SEITSONEN, AP
    VIRKKUNEN, R
    [J]. PHYSICAL REVIEW B, 1993, 47 (11): : 6381 - 6384
  • [4] Calculation of positron states and annihilation in solids: A density-gradient-correction scheme
    Barbiellini, B
    Puska, MJ
    Korhonen, T
    Harju, A
    Torsti, T
    Nieminen, RM
    [J]. PHYSICAL REVIEW B, 1996, 53 (24): : 16201 - 16213
  • [5] GRADIENT CORRECTION FOR POSITRON STATES IN SOLIDS
    BARBIELLINI, B
    PUSKA, MJ
    TORSTI, T
    NIEMINEN, RM
    [J]. PHYSICAL REVIEW B, 1995, 51 (11): : 7341 - 7344
  • [6] LOCALIZED POSITRONIUM-LIKE STATES IN IONIC-CRYSTALS
    BOEV, OV
    AREFIEV, KP
    [J]. PHYSICA STATUS SOLIDI B-BASIC RESEARCH, 1981, 106 (02): : 481 - 487
  • [7] ELECTRON-POSITRON DENSITY-FUNCTIONAL THEORY
    BORONSKI, E
    NIEMINEN, RM
    [J]. PHYSICAL REVIEW B, 1986, 34 (06): : 3820 - 3831
  • [8] ENHANCEMENT EFFECT ON POSITRON-ANNIHILATION WITH TIGHTLY BOUND ELECTRONS
    CHIBA, T
    DURR, GB
    BRANDT, W
    [J]. PHYSICA STATUS SOLIDI B-BASIC RESEARCH, 1977, 81 (02): : 609 - 614
  • [9] GALLIUM VACANCIES AND GALLIUM ANTISITES AS ACCEPTORS IN ELECTRON-IRRADIATED SEMIINSULATING GAAS
    CORBEL, C
    PIERRE, F
    SAARINEN, K
    HAUTOJARVI, P
    MOSER, P
    [J]. PHYSICAL REVIEW B, 1992, 45 (07): : 3386 - 3399
  • [10] NATIVE AND IRRADIATION-INDUCED MONOVACANCIES IN N-TYPE AND SEMI-INSULATING GAAS
    CORBEL, C
    PIERRE, F
    HAUTOJARVI, P
    SAARINEN, K
    MOSER, P
    [J]. PHYSICAL REVIEW B, 1990, 41 (15): : 10632 - 10641