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1

Digitale Medien

Threo aryl trifluoromethyl chlorohydrins: synthesis, reactivity, and structure (1992)

Solladie-Cavallo, A. ; Quazzotti, S. ; Fischer, J. ; [weitere]

s.l. : American Chemical Society

The @journal of organic chemistry 57 (1992), S. 174-178

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ISSN: 1520-6904

Quelle: ACS Legacy Archives

Thema: Chemie und Pharmazie

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1021/jo00027a033

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2

Digitale Medien

Photoemission studies on metals using picosecond ultraviolet laser pulses (1991)

Srinivasan-Rao, T. ; Fischer, J. ; Tsang, T.

[S.l.] : American Institute of Physics (AIP)

Journal of Applied Physics 69 (1991), S. 3291-3296

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ISSN: 1089-7550

Quelle: AIP Digital Archive

Thema: Physik

Notizen: We report the quantum efficiency of various metals irradiated by 266-nm, 4.66-eV laser pulses of 10-ps duration. The highest quantum efficiency obtained is 7.25×10−4 with samarium photocathodes. Current densities exceeding 66 and 21 kA/cm2 have been obtained from an area of 0.05 and 7 mm2, respectively. The maximum currents and current densities obtainable in these experiments are limited by the space charge. For surface fields exceeding 5×107 V/m on gold, the efficiency increases linearly with the field for the values investigated. Based on the quantum efficiency and optical damage threshold measurements, current densities exceeding 100 kA/cm2 seem feasible without damaging the photocathode.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.348550

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3

Digitale Medien

Nb/Ni and Ni/Nb bilayers on Si: Rapid thermal processing, phase separation, and ternary phase formation (1991)

Horache, E. ; Fischer, J. E. ; Van der Spiegel, J.

[S.l.] : American Institute of Physics (AIP)

Journal of Applied Physics 69 (1991), S. 7029-7033

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ISSN: 1089-7550

Quelle: AIP Digital Archive

Thema: Physik

Notizen: Ni/Nb and Nb/Ni bilayers on Si(100), Ni/NbSi2/Si(100) and Nb/Ni/Si/SiO2/Si(100) were produced by rf sputtering and annealed by rapid thermal processing. Thereafter, phase sequence and morphology were deduced by Auger electron spectroscopy and x-ray diffraction. The first three cases lead to phase separation of the binary compounds NbSi2 and NiSi2. Conversely when SiO2 is used as a buffer to limit the consumption of Si, the ternary phase Nb4Ni4Si7 or Nb4Ni4Si7+NbSi2 can be produced depending on the amount of Ni available. These observations are consistent with the Nb-Ni-Si phase diagram, in which phase separation occurs in a Si-rich environment whereas the ternary phase is stable in a Si-poor environment.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.347642

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4

Digitale Medien

Niobium disilicide formation by rapid thermal processing: Resistivity-grain growth correlation and the role of native oxide (1990)

Horache, E. ; Fischer, J. E. ; Van der Spiegel, J.

[S.l.] : American Institute of Physics (AIP)

Journal of Applied Physics 68 (1990), S. 4652-4655

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ISSN: 1089-7550

Quelle: AIP Digital Archive

Thema: Physik

Notizen: The formation of NbSi2 from Nb/Si(100) is studied using rf sputtering and rapid thermal processing. For a long sputter-etching time (10 min) of the Si substrate, NbSi2 is first formed at 720 °C. The lowest resistivity attained is 38 μΩ cm, one of the best for refractory metal silicides. The variation of the sheet resistance versus annealing temperature is correlated to grain growth. The grain size is deduced from the x-ray coherence length of the NbSi2(111) peak which sharpens and increases in intensity for T(approximately-greater-than)720 °C. For shorter sputter etching time (5 min), NbSi2 only forms above 895 °C. This is attributed to the native oxide at the Si interface. An estimated ternary phase diagram of Nb-Si-O shows that Nb and SiO2 coexist at this temperature. Unlike other refractory metal silicides, oxygen in the Nb film is expelled as the silicide is formed.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.346175

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5

Digitale Medien

Intense electron emission due to picosecond laser-produced plasmas in high gradient electric fields (1992)

Wang, X. J. ; Tsang, T. ; Kirk, H. ; [weitere]

[S.l.] : American Institute of Physics (AIP)

Journal of Applied Physics 72 (1992), S. 888-894

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ISSN: 1089-7550

Quelle: AIP Digital Archive

Thema: Physik

Notizen: Picosecond laser pulses at a wavelength of 266 nm have been focused onto a solid metal cathode in coincidence with high gradient electric fields to produce high brightness electron beams. At power densities exceeding 109 W/cm2, a solid density plasma is formed and intense bursts of electrons are emitted from the target accompanied by macroscopic surface damage. An inferred ∼1 μC of integrated charge with an average current of ∼20 A is emitted from a radio-frequency cavity driven at electric field gradients of ∼80 MV/m. In another experiment, where a dc extraction field of ∼6 MV/m is used, we observed an electron charge of ∼0.17 μC. Both results are compared with the Schottky effect and the Fowler–Nordheim field emission. We found that this laser-induced intense electron emission shares many features with the explosive electron emission processes. No selective wavelength dependence is observed in the production of the intense electron emission in the dc extraction field. The integrated electrons give an apparent quantum efficiency of ∼1.2%, which is one of the highest reported to date from metal photocathodes at these photon energies.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.351763

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6

Digitale Medien

Spin cast thin films of fullerenes and fluorinated fullerenes: Preparation and characterization by x-ray reflectivity and surface diffuse x-ray scattering (1992)

Belaish, I. ; Entin, I. ; Goffer, R. ; [weitere]

[S.l.] : American Institute of Physics (AIP)

Journal of Applied Physics 71 (1992), S. 5248-5250

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ISSN: 1089-7550

Quelle: AIP Digital Archive

Thema: Physik

Notizen: We demonstrate that high quality thin films of fullerenes (C60) and fluorinated fullerenes can be prepared from solution by the spin coating technique on float glass or silicon wafers. The films were characterized by x-ray reflectivity and diffuse x-ray scattering. A systematic study of films of different thicknesses allows estimation of the distance between the fullerenes spheres to be 10.9±1 A(ring) in our C60 films. The C60 film-air surface is very smooth. Annealing in air above 90 °C leads to an irreversible increase of the film thickness, which is attributed, at present, to oxidation.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.350583

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7

Digitale Medien

The role of attractive intermolecular forces in the density functional theory of inhomogeneous fluids (1992)

Sokolowski, S. ; Fischer, J.

College Park, Md. : American Institute of Physics (AIP)

The Journal of Chemical Physics 96 (1992), S. 5441-5447

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ISSN: 1089-7690

Quelle: AIP Digital Archive

Thema: Physik , Chemie und Pharmazie

Notizen: The density functional theory of Meister and Kroll for nonuniform simple fluids [Phys. Rev. A 31, 4055, (1985)] is modified in order to take into account pair correlations in the attractive energy term. The theory is applied for the calculation of density profiles of argon in the case of the free liquid surface and in the case of adsorption on "solid carbon dioxide.'' For the gas–liquid interface the theory yields dew and bubble densities, which are in good agreement with computer simulations. For the adsorption of argon on solid CO2, the first-order thin-film to thick-film transition is confirmed.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.462727

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8

Digitale Medien

Rotational dynamics and orientational melting of C60: A neutron scattering study (1992)

Neumann, D. A. ; Copley, J. R. D. ; Kamitakahara, W. A. ; [weitere]

College Park, Md. : American Institute of Physics (AIP)

The Journal of Chemical Physics 96 (1992), S. 8631-8633

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ISSN: 1089-7690

Quelle: AIP Digital Archive

Thema: Physik , Chemie und Pharmazie

Notizen: Well-defined librational excitations have been observed at energies of 2–3 meV in the low temperature ordered phase of solid C60. These relatively high energies imply a stiff orientational potential below the transition. The sharpness of the peaks indicates that this potential does not depend strongly on the axis of the angular displacement. The modes soften and broaden as the temperature approaches that of the orientational melting transition which occurs when the librational amplitude is a considerable fraction of nearest-neighbor interatomic angles.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.462876

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9

Digitale Medien

Relation between Born–Green–Yvon solutions and chemical potential for a fluid inside a pore (1990)

Sokolowski, S. ; Fischer, J.

College Park, Md. : American Institute of Physics (AIP)

The Journal of Chemical Physics 93 (1990), S. 6787-6792

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ISSN: 1089-7690

Quelle: AIP Digital Archive

Thema: Physik , Chemie und Pharmazie

Notizen: Limiting values of the one-particle background correlation function for inhomogeneous fluids are considered and used as boundary values for the integration of the Born–Green–Yvon equation. For a system of hard spheres in contact with a hard wall different approximations of the pair correlation function are tested with respect to (a) the consistency of the limiting values, (b) the behavior of the background correlation function inside the wall, and (c) the form of the local density in front of the wall. Then the study concentrates on using the Fischer–Methfessel version of the Born–Green–Yvon equation together with the limiting value of the one-particle background correlation function inside the solid for describing density profiles of a fluid inside a pore. Comparison of the results against computer simulations shows quite reasonable agreement.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.458948

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10

Digitale Medien

REGIONAL BRAIN STUDY OF INDOLEAMINE METABOLISM IN THE RAT IN ACUTE HEPATIC FAILURE (1976)

Cummings, M. G. ; James, J. H. ; Soeters, P. B. ; [weitere]

Oxford, UK : Blackwell Publishing Ltd

Journal of neurochemistry 27 (1976), S. 0

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ISSN: 1471-4159

Quelle: Blackwell Publishing Journal Backfiles 1879-2005

Thema: Medizin

Notizen: Abstract— Tryptophan, 5-hydroxytryptamine and 5-hydroindoleacetic acid were found to be greatly increased in various parts of the brains of rats in acute hepatic failure following two stage hepatic devascularization. However, the increases in 5-hydroxytryptamine and 5-hydroxyindoleacetic acid varied by region and are not explicable solely in terms of increased concentrations of tryptophan. The results are discussed in terms of differences in the regional metabolism of 5-hydroxyindoleamines. Plasma free fatty acids, albumin, total tryptophan and free tryptophan were measured in plasma in hopes of elucidating the mechanism responsible for the cerebral elevation of tryptophan. Increased plasma free tryptophan appears sufficient to explain the rapid increase in brain tryptophan. The relationship between these results and recent observations in hepatic encephalopathy is discussed.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1111/j.1471-4159.1976.tb10402.x

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