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  • American Institute of Physics (AIP)  (2)
  • American Association for the Advancement of Science (AAAS)  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Impedance match equation of state experiments using indirectly laser-driven multimegabar shocks (2002)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 9 (2002), S. 1721-1733 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Measurements of equation of state (EOS) points on the principal Hugoniots of Cu, Au, Pb and the plastics Parylene-C and brominated CH at multimegabar pressures have been made using the 1 TW HELEN laser at AWE. The aim was 1% accuracy in shock velocity measurement (3%–4% in pressure) in order to compare with data from gas-gun and nuclear underground test experiments and the theoretical EOS's based on, or supported by, these data. Experiments comprised a hohlraum heated by two 500 J, 0.53 μm wavelength, 1 ns Gaussian laser pulses generating an x-ray flux which drove a shock into a target consisting of a base, with steps of a known EOS material and of the material of unknown EOS. Shock breakout from base and steps was detected by monitoring light emission from the target with optical streak cameras and shock velocities were derived from the transit times across the known-height steps. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1465419
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Time resolved displacement interferometry for the characterization of preheat and free surface motion (abstract) : Papers from the thirteenth topical conference on high temperature plasma diagnostics (2001)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 72 (2001), S. 1101-1101 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: We report results from two separate experiments fielded on the AWE Helen laser facility both diagnosed by interferometry. In the first experiment, measurements were made on preheat in flat targets indirectly driven by 1.8 and 2.2 mm (length and diameter) hohlraums heated by two 0.53 μm, 3 ns duration shaped laser pulses, each of 400 J. The rear surface of the target acts as one mirror of a Michelson interferometer, and the fringe pattern produced is temporally resolved using an optical streak camera. Motion of the fringes prior to the arrival of the shock at the rear surface enables expansion due to preheating to be measured. In the second experiment spallation measurements were made on pure Al. Cylindrical targets (800 μm diameter×500 μm long) were directly driven with one beam of 0.53 μm. 200 ps duration laser pulses of 3–15 J. A time resolved Michelson interferometer recorded the motion of the free surface. Pull back, elastic precursor, and spallation signatures were observed and strain rates of 3×106 s−1 and spall strengths of 33 kbar were measured. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1326013
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  • 3
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    Seeded growth of single-crystal two-dimensional covalent organic frameworks (2018)
    American Association for the Advancement of Science (AAAS)
    In: Science
    Details
    Publication Date: 2018-07-06
    Description: Polymerization of monomers into periodic two-dimensional networks provides structurally precise, layered macromolecular sheets that exhibit desirable mechanical, optoelectronic, and molecular transport properties. Two-dimensional covalent organic frameworks (2D COFs) offer broad monomer scope but are generally isolated as powders comprising aggregated nanometer-scale crystallites. We found that 2D COF formation could be controlled using a two-step procedure in which monomers are added slowly to preformed nanoparticle seeds. The resulting 2D COFs are isolated as single-crystalline, micrometer-sized particles. Transient absorption spectroscopy of the dispersed COF nanoparticles revealed improvement in signal quality by two to three orders of magnitude relative to polycrystalline powder samples, and suggests exciton diffusion over longer length scales than those obtained through previous approaches. These findings should enable a broad exploration of synthetic 2D polymer structures and properties.
    Keywords: Chemistry, Materials Science
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Geosciences , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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