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  • 1
    Electronic Resource
    Electronic Resource
    Erratum: "Microcalorimetric measurements of the heat of adsorption of Pb on well-defined oxides: MgO(100) and p(2×1)-oxide on Mo(100)" [J. Chem. Phys. 114, 3752 (2001)] (2001)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 115 (2001), S. 6798-6798 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1404394
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  • 2
    Electronic Resource
    Electronic Resource
    Microcalorimetric measurements of the heat of adsorption of Pb on well-defined oxides: MgO(100) and p(2×1)-oxide on Mo(100) (2001)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 114 (2001), S. 3752-3764 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The energetics of Pb film grown at 300 K on two well-defined oxides [a MgO(100) thin film and a p(2×1)-oxide on Mo(100)] have been measured using single-crystal adsorption microcalorimetry. The evolution of the film morphology was followed using Auger electron spectroscopy (AES). An initial heat of adsorption of 103 kJ/mol is observed for the Pb/MgO(100) system. Auger results indicate that this is due to the formation of an ∼20 atom Pb island in the first pulse of Pb gas incident on the MgO(100) surface. This allows the extraction of a Pb–MgO(100) bond energy of ∼32±2 kJ/mol in the small two-dimensional particles formed in the first pulse. As more Pb is deposited onto the MgO(100) surface, the Pb forms three-dimensional islands. The integral of the heats of adsorption up to high coverage indicates an adhesion energy of 76.5±∼20 μJ/cm2 for large 3D Pb particles to the MgO(100) substrate. This indicates a Pb–MgO(100) bond energy of 49±13 kJ/mol at the 3D interface. Similar analyses of the Pb/p(2×1)-oxide on Mo(100) surface give an initial heat of adsorption of 146.2 kJ/mol and an adhesion energy of 82.5±20 μJ/cm2 for thick Pb films. This indicates a bond energy of 52±12 kJ/mol for a Pb atom to this surface at the interface of a thick Pb film. The metal's sticking probabilities as a function of coverage and the coverage-dependent changes in optical reflectivity were measured. For the Pb/MgO(100) system, an initial sticking probability of 0.70 at 300 K was observed, whereas for the Pb/p(2×1)-oxide on Mo(100) surface unit sticking probability was observed. The relationship between these quantities and the adsorption energetics is discussed. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1337097
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  • 3
    Electronic Resource
    Electronic Resource
    Adsorption and growth modes of Bi on Pt(111) (1986)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 85 (1986), S. 6176-6185 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The vapor deposition of Bi on Pt(111) at 110 and ∼600 K have been characterized by Auger electron spectroscopy (AES), thermal desorption mass spectroscopy (TDMS), low-energy electron diffraction (LEED), and changes in the work function (Δφ). At 110 K Bi growth follows a layer-by-layer mechanism. At ∼600 K Bi fills the first monolayer (θBi(approximately-equal-to)0.56) relatively uniformly, followed by 3D island growth. Bi desorption is characterized by a large, coverage-dependent desorption energy, Edes =(81−34.2 θBi ) kcal mol−1, in the first monolayer, and zero-order kinetics with constant activation energy (Edes =53–56 kcal mol−1) for the multilayer. Many LEED patterns are observed within the first monolayer for both cold and hot substrates. Structural models for these are proposed which are consistent with coverages obtained by AES. Annealed structures show continuous compression of hexagonal Bi overlayers with increasing coverage, subject to mild substrate constraints. At 110 K and θBi 〉0.33, uniaxial compression is instead seen, due to an unsurmounted energy barrier. Weakly repulsive lateral Bi–Bi interactions (due to dipole repulsions) dominate submonolayer growth. These results for the semimetal Bi are intermediate in behavior between alkali and transition metal overlayers on Pt(111). This is consistent with the relative strengths of the surface dipole of these adsorbed metals.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.451484
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  • 4
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    Exploring magnetized liner inertial fusion with a semi-analytic model (2016)
    American Institute of Physics (AIP)
    Details
    Publication Date: 2016-01-14
    Description: In this paper, we explore magnetized liner inertial fusion (MagLIF) [S. A. Slutz et al ., Phys. Plasmas 17 , 056303 (2010)] using a semi-analytic model [R. D. McBride and S. A. Slutz, Phys. Plasmas 22 , 052708 (2015)]. Specifically, we present simulation results from this model that: (a) illustrate the parameter space, energetics, and overall system efficiencies of MagLIF; (b) demonstrate the dependence of radiative loss rates on the radial fraction of the fuel that is preheated; (c) explore some of the recent experimental results of the MagLIF program at Sandia National Laboratories [M. R. Gomez et al ., Phys. Rev. Lett. 113 , 155003 (2014)]; (d) highlight the experimental challenges presently facing the MagLIF program; and (e) demonstrate how increases to the preheat energy, fuel density, axial magnetic field, and drive current could affect future MagLIF performance.
    Print ISSN: 1070-664X
    Electronic ISSN: 1089-7674
    Topics: Physics
    Published by American Institute of Physics (AIP)
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  • 5
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    Three-dimensional modeling of direct-drive cryogenic implosions on OMEGA (2016)
    American Institute of Physics (AIP)
    Details
    Publication Date: 2016-05-05
    Description: The effects of large-scale (with Legendre modes ≲ 10 ) laser-imposed nonuniformities in direct-drive cryogenic implosions on the OMEGA Laser System are investigated using three-dimensional hydrodynamic simulations performed using the newly developed code ASTER . Sources of these nonuniformities include an illumination pattern produced by 60 OMEGA laser beams, capsule offsets (∼10–20  μ m), and imperfect pointing, power balance, and timing of the beams (with typical σ rms ∼ 10 μ m, 10%, and 5 ps, respectively). Two implosion designs using 26-kJ triple-picket laser pulses were studied: a nominal design, in which an 874- μ m-diameter capsule is illuminated by about the same-diameter beams, and a more hydrodynamically efficient “ R 75” design using a 900- μ m-diameter capsule and beams of 75% of this diameter. Simulations show that nonuniformities caused by capsule offsets and beam imbalance have the largest effect on implosion performance. These nonuniformities lead to significant distortions of implosion cores, resulting in an increased residual kinetic energy and incomplete stagnation. The shape of distorted cores can be well characterized using neutron images but is less represented by 4–8 keV x-ray images. Simulated neutron spectra from perturbed implosions show large directional variations because of bulk motion effects and up to an ∼2 keV variation of the hot-spot temperature inferred from these spectra. The R 75 design suffers more from illumination nonuniformities. Simulations show an advantage of this design over the nominal design when the target offset and beam power imbalance σ rms are reduced to less than 5  μ m and 5%, respectively.
    Print ISSN: 1070-664X
    Electronic ISSN: 1089-7674
    Topics: Physics
    Published by American Institute of Physics (AIP)
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