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  • 75.30.Pd  (2)
  • Carboxyfluorescein  (1)
  • Springer  (3)
  • 1
    Electronic Resource
    Electronic Resource
    Spin-resolved inverse photoemission of ferromagnetic surfaces (1989)
    Springer
    Applied physics 49 (1989), S. 351-364 
    Details
    ISSN: 1432-0630
    Keywords: 75.30.Pd ; 75.50.Cc ; 79.60.−i
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Inverse photoemission (IPE) with spin-polarized electrons provides a way to measure separately the exchange-split majority and minority bands in ferromagnets above the Fermi level. Consequently spin-resolved IPE turns out to be an outstanding technique for obtaining information on surface magnetism: the magnetization of the topmost atomic layer may be investigated by measuring the exchange splitting of electronic states that are localized within the surface layer. Theoretical models of ferromagnetism may be tested by observing the temperature behavior of bands which contribute to the ferromagnetism of the material. The magnetic coupling of an adsorbate to the ferromagnetic substrate may be studied by probing adsorbate-induced bands. Results for the Ni(110) surface serve as an illustration to discuss the status of spin-resolved IPE and its application to the field of surface magnetism.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00615018
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  • 2
    Electronic Resource
    Electronic Resource
    Probing depth of the low energy cascade electrons from a transition metal (1991)
    Springer
    Applied physics 52 (1991), S. 206-209 
    Details
    ISSN: 1432-0630
    Keywords: 75.30.Pd ; 79.20.Hx ; 75.70.Ak
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract A surface probing depth of only ∼ 2 layers for low energy cascade electrons excited with a 3.2 keV primary electron beam is clearly demonstrated by model experiments with non-magnetic overlayers of Ta on magnetic substrates of Fe/Ni80Fe20. This result establishes a short probing depth of low energy electrons in transition metals generalizing the previously observed short magnetic probing depth for spin-polarized electrons in ferromagnets. The short probing depth sheds new light on a number of spectroscopic observations on ferromagnetic transition metals, and has important implications concerning surface magnetic properties and scattering processes of hot electrons in transition metals.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00324420
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  • 3
    Electronic Resource
    Electronic Resource
    Osmotically induced fluid-phase uptake of fluorescent markers by protoplasts ofChenopodium album (1992)
    Springer
    Protoplasma 166 (1992), S. 61-66 
    Details
    ISSN: 1615-6102
    Keywords: Osmocytosis ; CLSM ; Protoplast ; Carboxyfluorescein ; Lucifer Yellow CH
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Protoplasts fromChenopodium album suspension culture show large, up to 5-fold, changes in surface area upon hypertonic or hypotonie treatment. These surface area variations cannot be explained by elastic stretching of the plasmalemma. An exchange of membrane material between the plasmalemma and an internal membrane source takes place. Fluid-phase uptake experiments with the fluorescence dyes 5, 6-carboxyfluorescein and Lucifer yellow CH demonstrated that osmotic shrinkage of protoplasts is accompanied by vesicular uptake of the external medium into protoplast cytoplasm. Confocal laser scanning microscopy, as well as conventional fluorescence microscopy, revealed the number, diameter and distribution of the osmocytotic vesicles at different osmotic levels. The rate of osmocytotic vesicle uptake was higher in the presence of calcium chloride than in the presence of EDTA in the external medium. At 6.9 mM calcium chloride we observed a loss of vesicular fluorescence upon returning protoplasts to 0.4 M from 0.8 M sorbitol.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01320144
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