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  • 34.70  (3)
  • Springer  (3)
  • International Union of Crystallography
  • 1990-1994  (3)
  • 1970-1974
Collection
Keywords
Publisher
  • Springer  (3)
  • International Union of Crystallography
Years
  • 1990-1994  (3)
  • 1970-1974
Year
  • 1
    Electronic Resource
    Electronic Resource
    Intra- and inter-atomic auger processes in collisions of low energy He++, He+, He* (23,S, 21 S) and Li+ with Li covered W(110) surfaces (1992)
    Springer
    The European physical journal 22 (1992), S. 563-568 
    Details
    ISSN: 1434-6079
    Keywords: 32.80.D ; 34.70 ; 79.20.N
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Electron spectra from He++, He+ and Li+ (10 to 1500 eV) ions colliding under grazing incidence with Li covered W (110) surfaces are reported. The results are compared with those obtained from thermal collisions of (23 S; 21 S) metastable He atoms. In these collisions 1s vacancies are either produced during the collision event (energetic He+ (Li +) collisions) or are brought into the collision (slow He++ (He+, He*) collisions). Population of the 2s orbitals by two electrons produces states which decay by intraatomic Auger processes: we observe autoionization of He** (2s 2) and Li** (1s 2s 2) as well as autodetachment of He−* (1s 2s 2). Alternatively the 1s-holes in the projectile or target (Li) can be filled by Auger processes involving one or two surface electrons. The processes leading to electron emission are studied as a function of the Li coverage in the submonolayer region (0≦ΘLi≦1Ml) and as a function of the projectile energy. It is concluded that with one or two 1s vacancies present in the projectile the double capture of two surface electrons constitutes an important process responsible for electron emission of low work function surfaces.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01426356
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  • 2
    Electronic Resource
    Electronic Resource
    Electron emission in slow collisions of K+ ions with alkalated (K, Cs) W(110) surfaces (1991)
    Springer
    The European physical journal 21 (1991), S. 11-18 
    Details
    ISSN: 1434-6079
    Keywords: 32.80D ; 34.70 ; 79.20.N
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We have investigated K+ collisions (200 to 1000 eV) under grazing incidence with partially alkalated (K, Cs) W(110) surfaces by energy analysis of the ejected electrons. Three different mechanisms for electron emission could be identified (1) Kinetic emission mainly confined to projectile energies greater than 300 eV, (2) Auger deexcitation of excited projectile valence states yielding electrons with energies up to about 2.9 eV and (3) Creation of inner shell vacancies (Cs(5p −1) and K(3p −1)) which gives rise to Auger type processes (OVV and MVV) and to the formation of autoionizing states of the type A (np 5 n′s n″l) (A=Alkali atom). The relative importance of the three mechanisms is studied as a function of the alkali coverage of the surface and of the projectile's energy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01426612
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  • 3
    Electronic Resource
    Electronic Resource
    Electron emission in collisions of slow rare gas ions with partially cesiated W (110) (1993)
    Springer
    The European physical journal 28 (1993), S. 109-118 
    Details
    ISSN: 1434-6079
    Keywords: 32.80.D,H ; 34.70 ; 79.20.N
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We report the spectra of electrons emitted after slow collisions (50 eV) of rare gas ions (He+, Ne+, Ar+, and Xe+) with partially cesiated W(110) surfaces. The electron spectra are discussed in terms of the two interatomic Auger processes, Auger Capture and Auger Deexcitation and the intra-atomic Auger process, Autodetachment of Rg−* (He−* (1s 2s 2 2 S) in the case of He). Model calculations including these processes can qualitatively reproduce the measured spectra as well as experimental values for the electron emission coefficients, γ. This is demonstrated for collisions of He+ ions and thermal metastable He atoms with clean and partially cesiated W(110).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01436976
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