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  • 79.20.N  (4)
  • 34.50.H  (2)
  • Chemistry  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    Orientation and alignment of alkalip-states excited in low-energy collisions of alkali ions with noble gas atoms (1990)
    Springer
    The European physical journal 17 (1990), S. 237-243 
    Details
    ISSN: 1434-6079
    Keywords: 34.00 ; 34.50.H ; 34.70
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The orientation and alignment of Li(2p) excited in 1–2.5 keV Li+ collisions with He and Ar, and of Na(3p) excited in 2.5 keV Na+ collisions with He and Ne have been studied by the polarized photon-scattered particle coincidence technique. The covered range of scattering angles is between 1 and 18 degrees. The data are presented in terms of the alignment angle γ and the transferred angular momentumL ⊥. A qualitative analysis of the data is attempted on the basis of diabatic molecular orbital diagrams for the studied collisions systems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01437362
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  • 2
    Electronic Resource
    Electronic Resource
    Excitation in low-energy Li+ collisions with cesiated W(110) surfaces: alignment and orientation of the collisionally excited Li(2p) state (1990)
    Springer
    The European physical journal 16 (1990), S. 161-166 
    Details
    ISSN: 1434-6079
    Keywords: 34.50.H ; 34.70 ; 79.20.N
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The linear and circular polarization of the Li(2p−2s) emission has been measured for Li+ collisions with cesiated and oxydized cesiated W(110) surfaces, Cs-W(110) and O/Cs-W(110), at impact energies below 1 keV for an incidence angle of 5 degrees with respect to the surface plane. The cesium coverage has been varied between zero and the saturation coverage at room temperature. Although the excitation of the projectile seems to occur in a binary collision with only one Cs adatom, the presence of the surface influences the total photon yield by Auger deexcitation, and the circular polarization by affecting the energetic separation of the Li(2p) substates close to the surface.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01437329
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  • 3
    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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  • 4
    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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  • 5
    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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  • 6
    Electronic Resource
    Electronic Resource
    Application of environmental electron spectroscopy to AES of bulk ceramics (1991)
    Chichester [u.a.] : Wiley-Blackwell
    Surface and Interface Analysis 17 (1991), S. 947-950 
    Details
    ISSN: 0142-2421
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: Auger spectra from highly samples (Al2O3, Si3N4) are collected in a gaseous environment. It is demonstrated that the build-up of negative surface charge can be reduced considerably under suitable conditions. It is proposed that the decharging of the surface is initiated by Auger neutralization of the ions formed in the gaseous environment in collisions with the primary keV electrons.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/sia.740171307
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  • 7
    Electronic Resource
    Electronic Resource
    Charging Phenomena and Charge Compensation in AES on Metal Oxides and Silica (1997)
    Chichester [u.a.] : Wiley-Blackwell
    Surface and Interface Analysis 25 (1997), S. 390-396 
    Details
    ISSN: 0142-2421
    Keywords: Environmental AES ; Electron-Stimulated Desorption ; insulating surfaces ; aluminium oxide ; silicon oxide ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: Charging processes on the bulk oxides Al2O3, ZrO2 and SiO2 occurring during Auger Electron Spectroscopy (AES) are studied. All samples experience a negative charge-up under the following parameters: electron beam energy 〉1 keV, current density 〉10-2 A cm-2 and different angles of incidence. The samples show strong history effects as a function of previous irradiation damage. For charge compensation, Environmental Auger Electron Spectroscopy with O2 gas is applied; several traditional methods were applied for comparison. Charging of SiO2 and ZrO2 could be reduced considerably in an O2 environmental pressure of 〈5×10-8 Torr. Charging of Al2O3 could be compensated completely in this oxygen environment. It is shown that for the compensation of the electron beam effects, including electron-stimulated desorption and carbon contamination of the surface, an O2 atmosphere of 5×10-8 Torr is more efficient than using an auxiliary electron gun or low-energy positive ions. It is also more efficient than an Ar environment of 1×10-4 Torr. © 1997 John Wiley & Sons, Ltd.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
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