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  • Electronic Resource  (141)
  • 1995-1999  (49)
  • 1985-1989  (82)
  • 1955-1959  (10)
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  • 1870-1879
  • 1
    Electronic Resource
    Electronic Resource
    Total synthesis of (+)-pseudomonic acid C (1986)
    s.l. : American Chemical Society
    The @journal of organic chemistry 51 (1986), S. 3916-3918 
    Details
    ISSN: 1520-6904
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/jo00370a040
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  • 2
    Electronic Resource
    Electronic Resource
    (e, 2e) momentum spectroscopic study of the interaction of –CH3 and –CF3 groups with the carbon–carbon triple bond (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 89 (1988), S. 25-33 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Relative momentum densities have been measured for the outermost occupied π orbitals of acetylene, propyne, 2-butyne, and perfluoro-2-butyne using the (e, 2e) technique with an improved multiple detector spectrometer. The results, when compared with suitably averaged quantum mechanical calculations, show systematic differences between the molecules which can be interpreted in terms of wave function averages and differences using the ΔB(r) functions. A striking feature of the data is the significant momentum density at zero momentum for all of the molecules, in contrast to the calculations that all show zero momentum density. Ground state molecular distortions are discussed as a possible cause of the effect.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.455520
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  • 3
    Electronic Resource
    Electronic Resource
    (e,2e) momentum spectroscopic study of the C=C π orbitals of the vinyl halides (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 91 (1989), S. 1994-2001 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The distribution of electron momentum density has been measured for the outermost occupied orbitals of the vinyl halides and ethylene using the (e,2e) technique. In contrast to the ionization potentials for these π orbitals which decrease monotonically from vinyl fluoride to vinyl iodide, the values of the momenta where the distributions are a maximum, pmax, increase from the fluoride through the bromide and then shift back to a lower value for the iodide. This observation can be analyzed in terms of B(r), the Fourier transform of the observed momentum distribution, and ΔB(r), the difference between B(r) functions. The shape of ΔB(r) for the fluoride, chloride, and bromide in comparison to ethylene reflects the effect of the carbon–halogen antibonding interaction in these vinyl halides. On the other hand, in vinyl iodide the antibonding interaction is compensated for by the diffuse iodine 5p character of the molecular orbital. The relation of these observations to chemical properties of the vinyl halides is discussed along with differences between experiment and calculations at low momentum.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.457058
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Indirect drive experiments utilizing multiple beam cones in cylindrical hohlraums on OMEGA : The 39th annual meeting of division of plasma physics of APS (1998)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 5 (1998), S. 1960-1965 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Current plans for time-dependent control of flux asymmetry in the National Ignition Facility [J. A. Paisner, J. D. Boyes, S. A. Kumpan, and M. Sorem, "The National Ignition Facility Project," ICF Quart. 5, 110 (1995)] hohlraums rely on multiple beam cones with different laser power temporal profiles in each cone. Experiments with multiple beam cones have begun on the Omega laser facility [T. R. Boehly et al., Opt. Commun. 133, 495 (1997)] at the University of Rochester. In addition to allowing symmetry experiments similar to those performed on Nova [A. Hauer et al., Rev. Sci. Instrum. 66, 672 (1995)], the Omega facility allows multiple beam cones to be moved independently to confirm our ability to model the resulting implosion image shapes. Results indicate that hohlraum symmetry behaves similarly with multiple rings of beams as with a single ring, but with the weighted beam spot position used to parametrize the beam pointing.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.872866
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  • 5
    Electronic Resource
    Electronic Resource
    Symmetry experiments in gas-filled hohlraums at NOVA (1996)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 3 (1996), S. 2022-2028 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Understanding drive symmetry in gas-filled hohlraums is currently of interest because the baseline design of the indirect drive ignition target for the planned National Ignition Facility uses a gas-filled hohlraum. This paper reports on the results of a series of experiments performed at the Nova laser [C. Bibeau et al. Appl. Opt. 31, 5799 (1992)] facility at Lawrence Livermore National Laboratory with the goal of understanding time-dependent drive symmetry in gas filled hohlraums. Time-dependent symmetry data from capsule implosions and reemission targets in gas-filled hohlraums are discussed. Results of symmetry measurements using thin wall gas-filled hohlraums are also discussed. The results show that the gas is effective in impeding the motion of the wall blowoff material, and that the resulting implosion performance of the capsule is not significantly degraded from vacuum results. The implosion symmetry in gas differs from vacuum results with similar laser pointing indicating a shift in beam position on the hohlraum wall and hotter drive at the capsule's poles than at the equator. A theory has been proposed to explain the observed shift as a plasma physics effect: beam steering due to filamentation and transverse plasma flows. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.871999
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  • 6
    Electronic Resource
    Electronic Resource
    Multiple detector triple coincidence spectrometer for (e,3e) electron impact double-ionization measurements (1995)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 66 (1995), S. 3137-3143 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: An (e,3e) spectrometer for the study of double ionization of magnesium by electron impact is described. With the spectrometer the angular and energy distributions of the ejected electrons can be measured over a range of incident-electron energies. The spectrometer incorporates two ejected-electron electrostatic energy analyzers and a tandem electrostatic analyzer for the scattered electrons. Up to eight detectors can be placed at the focal planes of each of the ejected analyzers. This increases the data rate by a factor of 64 over arrangements with two ejected-electron detectors. In order to reduce noise and establish the energy of the final state of the doubly charged residual magnesium ion, triple-coincidence electronics are used with a preprocessing circuit to reduce dead time. The first double-ionization study with the instrument was the ejection of a 2p inner valence electron by a 3.5 keV incident electron accompanied by the subsequent filling of the 2p hole and the emission of a 35 eV Auger electron. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1145542
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  • 7
    Electronic Resource
    Electronic Resource
    A 32-channel preamplifier chip for the multiplicity vertex detector at PHENIX (1999)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 70 (1999), S. 1684-1687 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The TGV32, a 32-channel preamplifier–multiplicity discriminator chip for the multiplicity vertex detector (MVD) at PHENIX, is a unique silicon preamplifier in that it provides both an analog output for storage in an analog memory and a weighted summed-current output for conversion to a channel multiplicity count. The architecture and test results of the chip are presented. Details about the design of the preamplifier, discriminator, and programmable digital–analog converters performance as well as the process variations are presented. The chip is fabricated in a 1.2 μm, n-well, complementary metal–oxide–semiconductor process. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1149651
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  • 8
    Electronic Resource
    Electronic Resource
    Cross-linking of Bovine Plasma Albumin and Wool Keratin (1956)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 78 (1956), S. 2414-2418 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja01592a020
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  • 9
    Electronic Resource
    Electronic Resource
    Ion channeling analysis of a Si1−xGex(As)/Si strained layer (1989)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 54 (1989), S. 2571-2573 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A strained layer of Si1−x Gex (As)/Si has been grown by molecular beam epitaxy (MBE) with the As dopant introduced by 1 keV ion implantation during growth. Analysis of the layer was made using secondary-ion mass spectrometry (SIMS), Rutherford backscattering (RBS), and proton-induced x-ray emission (PIXE)/channeling, using 2 MeV H+ ions. The layer thickness (∼1.4 μm) and composition (x∼0.015; nAs ∼6×1018 cm−3) measurements by SIMS, RBS, and PIXE were in agreement. RBS, PIXE/channeling showed that the crystalline quality of the strained layer was equivalent to that of the Si substrate. The substitutional fraction (∼0.75) of the As dopant was determined by PIXE/channeling.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.101364
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  • 10
    Electronic Resource
    Electronic Resource
    Ion implantation and annealing of undoped (Al,Ga)As/GaAs heterostructures (1987)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 51 (1987), S. 1459-1461 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Electrical measurements of n+-GaAs/π-(Al,Ga)As/π-GaAs semiconductor-insulator-semiconductor (SIS) heterostructure capacitors and field-effect transistors (FET's) show that the (Al,Ga)As/GaAs heterojunction abruptness is well preserved for an arsine flash anneal of 1 s at temperatures up to ∼900 °C. The heterostructure stability is also preserved for a low-dose silicon implant across the (Al,Ga)As/GaAs heterojunction and subsequent annealing. Arsenic overpressure is found to be necessary, even for short time annealing, to prevent excessive As loss from a GaAs or (Al,Ga)As surface. High mobility enhance–deplete heterostructure SISFET's with sharp current versus voltage (I-V) turn-on characteristics have been fabricated using ion implantation and arsine flash anneal.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.98657
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