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  • 1
    Electronic Resource
    Electronic Resource
    Inositol Trisphosphate Mobilizes Intracellular Calcium in Permeabilized Adrenal Chromaffin Cells (1986)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of neurochemistry 46 (1986), S. 0 
    Details
    ISSN: 1471-4159
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Abstract: Using permeabilized chromaffin cells and the fluorescent probe Quin 2 (an indicator of free Ca2+), we found that inositol trisphosphate (IP3) specifically triggered an immediate and dose-dependent release of Ca2+ from intracellular stores. Desensitization of the response was observed at nonsaturating concentrations of inositol trisphosphate and resequestration of Ca2+ was not observed. While representing only a small fraction of the total cellular Ca2+, the amount released by IP3 could significantly raise cytosolic Ca2+ and may account for muscarinic effects on Ca2+ metabolism in chromaffin cells.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1471-4159.1986.tb13014.x
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  • 2
    Electronic Resource
    Electronic Resource
    X-ray magnetic circular dichroism studies of multilayered thin films of 3d transition metals (invited) (abstract) : 38th Annual Conference on Magnetism and Magnetic Materials (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 5807-5807 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: X-ray magnetic circular dichroism (XMCD) is used to probe both the spin and orbital d moments of Co in Co/Pd, Co/Pt, and Co/Ni multilayers, and in a Au/Co-wedge/Pd structure. While the spin moment per Co atom is found to be constant within the experimental error, the orbital moment shows a strong dependence both on the chemical environment and on the thickness of the Co layer. In particular, we find an orbital moment enhancement of up to a factor of three for a Co layer thickness of four atomic layers in the present Au/Co/Pd sandwich structure. This enhancement decays to the bulk Co value, roughly following a 1/dCo dependence, thus confirming its interfacial origin. The relevance of these observations with respect to the perpendicular magnetic anisotropy in these samples will be discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.355571
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  • 3
    Electronic Resource
    Electronic Resource
    Element specific magnetic microscopy with x rays (invited) (abstract) : 38th Annual Conference on Magnetism and Magnetic Materials (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 6890-6890 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have used the magnetic circular x-ray dichroism (MCXD) technique to image magnetic domains with a spatial resolution of 1 μm. The experiments employed circularly polarized soft x rays near the edges of the three-dimensional (3d) transition metals Co ((approximately-equal-to)780 eV) and Ni ((approximately-equal-to)850 eV) and a photoemission microscope based on an electrostatically imaging lens system. Element specific contrast is obtained by tuning to a specific L edge resonance ("white line'') and imaging the number of secondary electrons created locally near the surface of the sample. The magnetic contrast arises from the fact that the white line intensity depends on the relative orientation of the photon spin and the local magnetization direction. The obtained contrast is remarkably large ((approximately-equal-to)20%) such that images can be recorded without background subtraction. Images taken at the L3 and L2 resonance energies give reversed contrast, as expected. Because of the long x-ray and secondary electron mean free paths, images can be recorded for buried magnetic layers which makes this new technique especially valuable for technological applications.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.356822
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  • 4
    Electronic Resource
    Electronic Resource
    First experimental results from IBM/TENN/TULANE/LLNL/LBL undulator beamline at the advanced light source : Proceedings of the 5th international conference on synchrotron radiation instrumentation (1995)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 66 (1995), S. 1394-1397 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The IBM/TENN/TULANE/LLNL/LBL Beamline 8.0 at the advanced light source combining a 5.0 cm, 89 period undulator with a high-throughput, high-resolution spherical grating monochromator, provides a powerful excitation source over a spectral range of 70–1200 eV for surface physics and material science research. The beamline progress and the first experimental results obtained with a fluorescence end station on graphite and titanium oxides are presented here. The dispersive features in K emission spectra of graphite excited near threshold, and found a clear relationship between them and graphite band structure are observed. The monochromator is operated at a resolving power of roughly 2000, while the spectrometer has a resolving power of 400 for these fluorescence experiments. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1145985
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  • 5
    Electronic Resource
    Electronic Resource
    Curve fitting analysis of near-edge core excitation spectra of free, adsorbed, and polymeric molecules (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 88 (1988), S. 3539-3554 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The quantitative analysis of the near-edge region of K-shell excitation spectra of free, chemisorbed, condensed, and polymeric molecules is undertaken using curve fitting procedures. The deconvolution of both x-ray absorption (NEXAFS) and electron impact near-edge excitation spectra is considered. Among the topics discussed are the line shape of resonances in the near-edge region, the line shape of the continuum steps, physical interpretations for the line shapes, and parameters describing core excitation spectral features, and background corrections for NEXAFS spectra. The goal of the work is to establish systematic procedures for analyzing near-edge spectra which allow peak positions to be consistently determined, and enable peak areas to be reliably obtained so that, e.g., the orientation of molecules can be determined from NEXAFS spectra. A more quantitative understanding of the features in near-edge spectra will also aid development of an understanding of the physical events underlying a near-edge spectrum.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.453902
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  • 6
    Electronic Resource
    Electronic Resource
    The orientation of Langmuir–Blodgett monolayers using NEXAFS (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 88 (1988), S. 4076-4087 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Carbon K-shell NEXAFS (near edge x-ray absorption fine structure) spectra of oriented hydrocarbon chains in Langmuir–Blodgett (LB) monolayers were measured and used to study the orientation of these molecules. The LB monolayers were assembled from arachidic acid or cadmium or calcium arachidate on the oxidized Si(111) surface. The observed NEXAFS resonances are assigned to transitions to excited states which are localized on individual CH2 groups or C–C bonds. From a detailed analysis using curve-fitting techniques of the angular dependence of the various spectral peaks, the hydrocarbon chains of the cadmium arachidate monolayer is estimated to lie within 15° of the surface normal, the hydrocarbon chains of the calcium arachidate monolayer is estimated to be tilted by 33±5° from the surface normal, while the arachidic acid monolayer is not ordered at all. The determined chain orientations are discussed in terms of a microscopic model involving lateral interactions between the zig–zag hydrocarbon chains.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.453862
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  • 7
    Electronic Resource
    Electronic Resource
    K-shell shape resonances and intramolecular bond lengths. Comments on "The relationship between shape resonances and bond lengths'' (1987)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 87 (1987), S. 3253-3255 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A rebuttal is given to the critique by Piancastelli et al. [J. Chem. Phys. 86, 2765 (1987)] of the relationship between 1s→σ* excitation energies and bond lengths proposed by Sette et al. [J. Chem. Phys. 81, 4906 (1984)]. The anomalous character of σ* resonances in the C1s and O1s spectra of CO2 is explained in terms of dipole selection rules and a large energy splitting between the σ@B|g and σ*u orbitals.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.453016
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  • 8
    Electronic Resource
    Electronic Resource
    Inner shell excitation of thiophene and thiolane: Gas, solid, and monolayer states (1986)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 85 (1986), S. 4835-4848 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The electron energy loss spectra of gaseous thiophene and thiolane in the regions of S 2p, S 2s, and C 1s are presented along with the x-ray photoelectron yield (NEXAFS) spectra of both gases in the region of S 1s excitation. The thiophene spectra are compared to the corresponding NEXAFS spectra of solid (multilayer) and monolayer thiophene on Pt (111). MS-Xα calculations of the C 1s, S 2p, and S 1s excitation spectra of free thiophene are also reported. Intercomparison of the gas, surface, and calculated spectra allows a complete interpretation of the spectral features and facilitates determination of the molecular orientation of thiophene with respect to the surface in both the compressed [thiophene on Pt (111) at 150 K] and relaxed [thiophene on Pt (111) at 180 K] monolayer phases.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.451718
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  • 9
    Electronic Resource
    Electronic Resource
    Resonances in the K shell excitation spectra of benzene and pyridine: Gas phase, solid, and chemisorbed states (1985)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 83 (1985), S. 6099-6107 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: K shell excitation spectra of the aromatic molecules benzene and pyridine in the gas phase are compared to those for the solids (ices) and for monolayers chemisorbed on Pt(111). The gas phase and solid spectra are essentially identical and even the spectra for the chemisorbed molecules exhibit the same resonances. Because of the orientation of the molecules upon chemisorption the latter spectra show a strong polarization dependence as a function of x-ray incidence. This polarization dependence in conjunction with a multiple scattering Xα calculation for the benzene molecule allows us to assign the origin of all K shell resonances. The resonances are found to arise from transitions to π* antibonding orbitals and to σ* shape resonances in the continuum. The shape resonances are characterized by potential barriers in high (l=5 and 6) angular momentum states of the excited photoelectron. The polarization dependence and energy position of the resonances allow the molecular orientation on the surface to be determined and show that the change in the carbon–carbon bond length is less than 0.02 A(ring).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.449601
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  • 10
    Electronic Resource
    Electronic Resource
    Structure and bonding of chemisorbed ethylene and ethylidyne on Pt(111) from near edge x-ray absorption fine structure spectroscopy and multiple scattering calculations (1985)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 83 (1985), S. 3146-3153 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The near edge x-ray absorption fine structure (NEXAFS) spectra of ethylene on Pt(111) at 90 and 300 K have been measured and compared to the spectra calculated using the multiple scattering Xα method for cluster models of adsorbed ethylene and ethylidyne. The results indicate that ethylene is adsorbed in the di-σ configuration (sp3 hybridization) at 90 K, and that the π* orbital retains its identity in this configuration, with no component along the C–C axis. The spectrum obtained at 300 K is attributed to ethylidyne (CCH3) and the calculated spectrum for a cluster consisting of this species bonded symmetrically to three Pt atoms is in good agreement with experiment. The calculations show that the multiple scattering molecular cluster approach is a useful technique for interpreting the NEXAFS spectra of adsorbed molecules.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.449220
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