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  • Articles: DFG German National Licenses  (26)
  • 1
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 71 (1992), S. 1153-1162 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The generation of x rays from the interaction of low-energy (10–50 mJ) 120-ps KrF laser pulses with solid targets has been experimentally investigated. Conversion efficiency as a function of laser energy and detailed keV x-ray spectra have been obtained for targets (Fe, Ni, and Cu) with potential application in high-resolution x-ray lithography. Peak x-ray conversion efficiencies of over 3% in the 800–1400-eV photon energy band have been measured for laser intensities of 1.5 × 1014 W/cm2. In addition, transmission grating spectra have been obtained to characterize the overall distribution of x-ray emission at photon energies down to 100 eV.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 89 (1988), S. 1030-1041 
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The crystal growth rates of Lennard-Jones fcc (face-centered cubic) (111) and (100) faces into the melt have been studied as a function of undercooling by molecular dynamics. The (100) grows without activation energy barrier at rates determined by the difference in the free energies of the crystal and melt phases, and the arrival rate of atoms across a plane determined from the kinetic theory of gases. The maximum velocity occurs at approximately half the melting point and represents 80 m/s for argon. The (111), on the other hand, grows at rates two to three times lower than this; the exact rate being size dependent. The growth kinetics are now activated and resemble Wilson–Frenkel behavior. However, the step responsible for such activation is not the simple liquid diffusion of Wilson–Frenkel theory, but rather the concerted motion of atoms at the interface selecting either all fcc or all hcp (hexagonal close packed) triangular lattice sites before a layer can grow.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 5047-5053 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The generation of keV x-ray emission from plasma produced by a 15 mJ 90 ps KrF laser pulse focused to an 8 μm spot on a copper target preceded by a similar 8 mJ pulse is studied experimentally. The change in efficiency of generation of keV x rays by the second pulse due to the presence of plasma produced by the preceding laser pulse on target is investigated as a function of the spatial and temporal separation of the laser pulses. When closely overlapped in space and time the pair of pulses behave like a single higher intensity pulse. When separated in space by more than 100 μm the two pulses behave independently generating x rays at the same rate as they would as two separate pulses. However, when overlapped in space and separated in time the x-ray generation by the second pulse is enhanced for small temporal separations and then suppressed for larger temporal separations due to the plasma created by the first pulse. These results can be explained by the initial production of hot plasma which enhances x-ray generation followed by the production of an extended colder plasma from the unloading of the shock heated target surface which suppresses keV x-ray production by the second pulse. The observed time of transition from enhancement to reduction of x-ray generation agrees with the time for the hot initial plasma due to the first laser pulse to expand and cool significantly.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    The @journal of organic chemistry 35 (1970), S. 1126-1129 
    ISSN: 1520-6904
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 65 (1994), S. 830-832 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report the accurate determination of the absolute density of the pulsed-laser deposited amorphous carbon ultrathin films as well as the film density evolution with the substrate temperatures Ts (22–300 °C) using high-resolution x-ray reflectivity. The density values ρ for the films deposited with laser power density of 8×108 W/cm2 varied from 3.10 to 2.40 g/cm3 as the substrate temperature increased from 22 to 300 °C. This result, together with the optical band-gap values obtained by transmittance measurements, clearly indicates a diamond-like to graphite-like microstructure change near Ts=200 °C.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 60 (1992), S. 1818-1820 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: High efficiency generation of keV x-rays from copper and iron targets has been studied using 50 mJ, 90 ps KrF laser pulses. By use of an aberration corrected 125 mm focal length lens conversion efficiencies of 9% and 10% into 800–1400 eV x-rays have been obtained for copper and iron targets. This is a substantial increase over the 2%–3% previously measured in a similar experiment and is comparable to results obtained with much larger laser energies.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Oxford, UK : Munksgaard International Publishers
    Community dentistry and oral epidemiology 32 (2004), S. 0 
    ISSN: 1600-0528
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Abstract –  Objectives:  To determine whether adult oral health is predicted by (a) childhood socioeconomic advantage or disadvantage (controlling for childhood oral health), or (b) oral health in childhood (controlling for childhood socioeconomic advantage or disadvantage), and whether oral health in adulthood is affected by changes in socioeconomic status (SES).Methods:  Participants in a longstanding cohort study underwent systematic dental examination for dental caries and tooth loss at ages 5 and 26 years. The examination at age 26 years included the collection of data on periodontal attachment loss and plaque level. Childhood SES was determined using parental occupation, and adult SES was determined from each study member's occupation at age 26 years. Regression models were used to test the study hypotheses.Results:  Complete data were available for 789 individuals (47.4% female). After controlling for childhood oral health, those who were of low SES at age 5 years had substantially greater mean DFS and DS scores by age 26 years, were more likely to have lost a tooth in adulthood because of caries, and had greater prevalence and extent of periodontitis. A largely similar pattern was observed (after controlling for childhood SES) among those with greater caries experience at age 5 years. For almost all oral health indicators examined, a clear gradient was observed of greater disease at age 26 years across socioeconomic trajectory groups, in the following order of ascending disease severity and prevalence: ‘high–high’, ‘low–high’ (upwardly mobile), ‘high–low’ (downwardly mobile) and ‘low–low’.Conclusion:  Adult oral health is predicted by not only childhood socioeconomic advantage or disadvantage, but also by oral health in childhood. Changes in socioeconomic advantage or disadvantage are associated with differing levels of oral health in adulthood. The life-course approach appears to be a useful paradigm for understanding oral health disparities.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 91 (1987), S. 6347-6359 
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Materials Research 16 (1986), S. 487-516 
    ISSN: 0084-6600
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 74 (1993), S. 3712-3723 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The emission of 800–1400 eV x rays from plasmas produced by KrF discharge laser pulses with durations in the range of 1 and 100 ps with energies up to 50 mJ has been studied using various metal targets. The emission spectra, angular distribution, and x-ray conversion efficiencies into 2π Sr have been measured in vacuum. Peak conversion efficiencies of 10%–13% were obtained for Fe, Co, Ni, Cu, and Zn when a 90 ps, 50 mJ pulse was used. A 2 ps, 40 mJ pulse yielded efficiencies of 8%–10% with plasma reflectivity accounting for the reduction in conversion efficiency. An 850 fs, 35 mJ pulse gave reduced yields of 4% for Cu. In a background gas of 1 atm helium a reduction of conversion efficiency by 15% was observed for 90 ps pulses.
    Type of Medium: Electronic Resource
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