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  • 1
    Electronic Resource
    Electronic Resource
    Single-pulse ultraviolet laser-induced surface modification and ablation of polyimide (1998)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 73 (1998), S. 847-849 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Single-pulse laser ablation of polyimide was investigated by using focused UV-Ar+-laser radiation (λ(approximate)302 nm, 140 ns≤τl≤50 ms) and atomic force microscopy. The results clearly demonstrate that the ablation rates do not depend on the total dose only, but depend as well on the duration of the laser pulses, τl. The experimental results can be interpreted almost quantitatively on the basis of a purely thermal model. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.122021
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  • 2
    Electronic Resource
    Electronic Resource
    Quantum-well states in copper thin films (1999)
    [s.l.] : Macmillan Magazines Ltd.
    Nature 398 (1999), S. 132-134 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] A standard exercise in elementary quantum mechanics is to describe the properties of an electron confined in a potential well. The solutions of Schrödinger's equation are electron standing waves—or ‘quantum-well’ states—characterized by the quantum number n, the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/18178
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  • 3
    Electronic Resource
    Electronic Resource
    Laser-induced dendritic structures on PET (polyethylene- terephthalate): the importance of redeposited ablation products (1999)
    Springer
    Applied physics 69 (1999), S. S487 
    Details
    ISSN: 1432-0630
    Keywords: PACS: 42.62; 61.80; 68.35
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract. Single-pulse excimer-laser irradiation of poly-ethylene-terephthalate (PET) with fluences around and above the ablation threshold leads to the formation of surface dendrites. The lateral size and the number density of dendrites depend on the laser wavelength and the type and pressure of the ambient atmosphere. The results are discussed on the basis of excimer-laser-induced polymer fragmentation and the redeposition of ablation products.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003390051447
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  • 4
    Electronic Resource
    Electronic Resource
    Particles in laser ablation of polytetrafluoroethylene (1999)
    Springer
    Applied physics 69 (1999), S. S467 
    Details
    ISSN: 1432-0630
    Keywords: PACS: 79.20.Ds; 61.41.+e; 84.37.+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. KrF-laser ablation of pressed polytetrafluoroethylene (PTFE) targets is accompanied by the ejection of submicron- to micron-sized particles. Collected ejecta consist of four basic particle morphologies ranging from small particles 50–200 nm in diameter to larger particles ∼10 μm in diameter. Many particles carry electric charge as measured by using charged electrodes and by the Millikan technique. Thin PTFE films deposited by pulsed laser deposition (PLD) from the same targets onto heated Si substrates are highly crystalline and show only a minor but detectable increase of defects compared with the target material. The transferred particulates mainly consist of long PTFE molecule chains. The low molecular weight material that is also transferred to the substrate mainly either links with other low molecular weight material or evaporates during deposition.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003390051440
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  • 5
    Electronic Resource
    Electronic Resource
    Circular dichroism in 4 f photoemission from magnetically ordered rare-earth materials (1995)
    Springer
    Applied physics 60 (1995), S. 179-189 
    Details
    ISSN: 1432-0630
    Keywords: PACS: 75.50.Cc; 78.20.Ls; 79.60.Cn
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract.  4 f Photoemission (PE) spectra from magnetically ordered rare-earth materials using circularly polarized X-rays exhibit strong Magnetic Circular Dichroism (MCD), i.e., the intensities of the individual multiplet lines depend on the relative orientation of sample magnetization and photon spin. On the example of the well- resolved Tb 4 f PE multiplet, it is shown that in relevant cases 4 f PE lines are esse ntially only observed for one magnetization direction, either parallel or antiparallel to the photon spin. These large MCD effects in 4 f PE open new perspectives in the analysis of surface and thin-film magnetism and provide a sensor for the degree of circular polarization of soft X-rays over a wide photon-energy range. To demonstrate the potential of MCD in 4 f PE as a magnetometer, we studied Gd(0001) and Tb(0001), where the magnetization of the topmost atomic (0001) layer can be easily separated from the bulk magnetization via the surface core-level shift. In multicomponent magnetic thin films containing different rare-earth elements, 4 f PE allows to monitor magnetization in an element-specific way, e.g., in case of the hetero-magnetic interface 1ML Eu/Gd(0001).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003390050088
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  • 6
    Electronic Resource
    Electronic Resource
    Circular dichroism in 4f photoemission from magnetically ordered rare-earth materials (1995)
    Springer
    Applied physics 60 (1995), S. 179-189 
    Details
    ISSN: 1432-0630
    Keywords: 75.50.Cc ; 78.20.Ls ; 79.60.Cn
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract 4f Photoemission (PE) spectra from magnetically ordered rare-earth materials using circularly polarized X-rays exhibit strong Magnetic Circular Dichroism (MCD), i.e., the intensities of the individual multiplet lines depend on the relative orientation of sample magnetization and photon spin. On the example of the wellresolved Tb 4f PE multiplet, it is shown that in relevant cases 4f PE lines are essentially only observed for one magnetization direction, either parallel or antiparallel to the photon spin. These large MCD effects in 4f PE open new perspectives in the analysis of surface and thin-film magnetism and provide a sensor for the degree of circular polarization of soft X-rays over a wide photon-energy range. To demonstrate the potential of MCD in 4f PE as a magnetometer, we studied Gd(0001) and Tb(0001), where the magnetization of the topmost atomic (0001) layer can be easily separated from the bulk magnetization via the surface core-level shift. In multicomponent magnetic thin films containing different rare-earth elements 4f PE allows to monitor magnetization in an element-specilic way, e.g., in case of the hetero-magnetic interface 1 ML En/Gd(0001).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01538244
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  • 7
    Electronic Resource
    Electronic Resource
    UV-laser-induced surface topology changes in polyimide (1996)
    Springer
    Applied physics 63 (1996), S. 337-339 
    Details
    ISSN: 1432-0630
    Keywords: PACS: 42.60; 81.60
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract.  Surface topology changes in polyimide induced by single UV-laser pulses with pulse durations between 140 ns and 5 μs are investigated by means of atomic force microscopy. With increasing fluence three different regimes are found: (a) real material removal (ablation), (b) swelling of the irradiated area above the level of the untreated surface (hump formation) and (c) lowering of the irradiated area below the level of the untreated surface (dent formation). A detailed description of these topology changes is given and different formation processes are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003390050395
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  • 8
    Electronic Resource
    Electronic Resource
    Step-like growth of Bi2Sr2CaCu2O8 films on off-axis oriented (0 0 1) SrTiO3 (1996)
    Springer
    Applied physics 63 (1996), S. 427-429 
    Details
    ISSN: 1432-0630
    Keywords: PACS: 81.15Z; 68.55; 74.70
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract.  High-quality Bi2Sr2CaCu2O8 (BSCCO) films were grown by means of pulsed-laser deposition on 10° off-axis oriented (0 0 1) SrTiO3 substrates. The films exhibit a step-like morphology and they are properly oriented along the (0 0 1) direction. Their normal-state resistivity measured along the tilt (off-axis (1 0 0) direction of the substrate) was, typically, 260 times higher than that along the (0 1 0) direction. Such films reveal a transverse Seebeck-effect which significantly exceeds that observed with YBa2Cu3O7 (YBCO).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01571668
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  • 9
    Electronic Resource
    Electronic Resource
    Step-like growth of Bi2Sr2CaCu2O8 films on off axis oriented (001) SrTiO3 (1996)
    Springer
    Applied physics 63 (1996), S. 427-429 
    Details
    ISSN: 1432-0630
    Keywords: 81.152 ; 68.55 ; 74.70
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract High-quality Bi2Sr2CaCu2O8 (BSCCO) films were grown by means of pulsed-laser deposition on 10° off-axis oriented (001) SrTiO3 substrates. The films exhibit a step-like morphology and they are properly oriented along the (001) direction. Their normal-state resistivity measured along the tilt (off-axis (100) direction of the substrate) was, typically, 260 times higher than that along the (010) direction. Such films reveal a transverse Seebeck-effect which significantly exceeds that observed with YBa2Cu3O7 (YBCO).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01571668
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  • 10
    Electronic Resource
    Electronic Resource
    Rapid Communication Single-shot UV-laser ablation of polyimide with variable pulse lengths (1996)
    Springer
    Applied physics 63 (1996), S. 87-90 
    Details
    ISSN: 1432-0630
    Keywords: PACS42.60; 81.60
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract. Single-shot laser ablation of polyimide has been investigated with UV-Ar $^+$ -laser radiation ( $\lambda =$ 270–315 nm) for pulse lengths between 140 ns and 5 $\mu$ s. The irradiated polymer surface was studied with respect to its morphology and ablated depth by means of atomic force microscopy. The dependence of the ablation threshold on laser pulse-length and intensity can be tentatively interpreted on the basis of a thermal process and a (thermal or non-thermal) mechanism which diminishes the activation energy for the desorption of species from the surface.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01579750
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