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  • 1
    Electronic Resource
    Electronic Resource
    Soft x-ray synchrotron radiation facilities for the study of magnetic materials (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. 6811-6811 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Synchrotron radiation sources are used for a variety of measurements of magnetic materials, including photoemission spectroscopy of band-structure (both with and without spin polarization), photoabsorption spectroscopy, and x-ray scattering. Recently, considerable attention has been paid to applications of circularly polarized monochromatic synchrotron radiation to spectroscopy and scattering of magnetic materials. Magnetic x-ray circular dichroism (MXCD), present in both x-ray absorption and x-ray photoemission spectra, can be used as a site- and element-specific probe of local magnetic moment. With suitable instrumentation, the MXCD effect can be used to image magnetic domain structure of surfaces and buried layers, with element (and potentially chemical-state) specificity. Examples of studies using MXCD with an existing bending-magnet light source will be shown, and used to introduce the performance of a new, undulator-based variable polarization beamline under construction at SRC.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.356840
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  • 2
    Electronic Resource
    Electronic Resource
    Density dependence of the conduction-band minimum in fluid krypton and xenon from field ionization of (CH3)2S (1997)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 107 (1997), S. 1759-1764 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The ionization potential distribution of (CH3)2S doped in fluid krypton and xenon has been determined by means of field ionization in wide density ranges. These distributions are simulated by convoluting the field spectrum of pure (CH3)2S with the calculated polarization energy distribution of the dopant ion in the media. The density dependence of the conduction-band energy of excess electrons (V0) in the fluids is obtained from the energy shift between the experimental and simulated spectra. The resulting V0 values are compared with previous experimental results and several theoretical calculations. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.474529
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  • 3
    Electronic Resource
    Electronic Resource
    Polarization energy distribution for impurity molecules in dense gases (1998)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 109 (1998), S. 7663-7666 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The polarization energy distribution of impurity molecules in dense gases is investigated. An approximate expression is derived for a random distribution and compared with results inferred from finite-temperature Monte Carlo studies for NO in argon (ρ≤2.7×1021 cm−3). It is found that when ρ≤1.8−2.0×1021 cm−3, the distribution has a similar shape with approximately the same peak position as that obtained from the Monte Carlo calculations. This result indicates that the peak position in this density range is due primarily to the r−4 dependence of the polarization energy and the random positions of the host molecules and does not reflect the hard core of the intermolecular interactions. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.477412
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  • 4
    Electronic Resource
    Electronic Resource
    Density dependence of the ionization potential of CH3I in argon and of the quasi-free electron energy in argon (1995)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 103 (1995), S. 506-513 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Field ionization has been employed as a new technique to determine the ionization potential of an impurity doped in a nonpolar fluid. This has been shown for a model system, CH3I doped into argon for argon densities ranging from the gas up to the triple point liquid. The ionization potential in the medium reflects the different possible configurations of the medium atoms around the dopant at the moment of excitation and, therefore, is given by a distribution. This distribution is identified with that of the polarization energy between the positive ion and the medium. The first and second moments of the polarization distribution were calculated at the densities at which the experiments were performed. Simulated spectra (generated using the experimental results obtained in pure CH3I, the calculated moments, and a Gaussian shape for the polarization distribution) reproduce closely the experimental ionization potential. Furthermore, by combining the experimental data with the calculated distributions, we obtained the density dependence of the quasi-free electron energy in argon. These results are consistent with previous experimental data and with recent theoretical calculations. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.470136
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  • 5
    Electronic Resource
    Electronic Resource
    Exciplex vacuum ultraviolet emission spectra of KrAr: Temperature dependence and potentials (1996)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 105 (1996), S. 9021-9026 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The temperature dependence of the emissions from the 0+(3P1)and 1(3P2) Kr*Ar exciplex states in the range 85–350 K was studied using time resolved techniques, vacuum ultraviolet synchrotron radiation, and argon samples doped with minimal amounts of krypton. As the temperature is increased, the emission shifts to the blue, its width increases by almost a factor of 2, and the line shape becomes asymmetrical. The experimental line shapes have been simulated by means of Franck–Condon density calculations using the available ground state potential of Aziz and Slaman [Mol. Phys. 58, 679 (1986)] and by modeling the exciplex potentials as Morse curves. The potential parameters for the 0+ and 1 states are re=5.05±0.01 and 5.07±0.01 a0, respectively; De=1150±200 cm−1 and β=1.4±0.1 a0−1 for both states. The latter two values yield ωe=140 cm−1 and ωexe=4.3 cm−1. The energy positions of the exciplexes's wells and their depths are compared with published results. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.472736
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  • 6
    Electronic Resource
    Electronic Resource
    Density dependence of the ionization potential of CH3I in krypton and of the quasi-free electron energy in krypton (1995)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 103 (1995), S. 4484-4489 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Field ionization has been employed to determine the ionization potential of CH3I doped in krypton for krypton densities between the gas and the triple point liquid. The ionization potential is correlated to the different configurations of the host atoms around the dopant at the moment of excitation and is, therefore, represented by a distribution. The ion-medium polarization energy distribution was calculated, from the first and second moments, at the densities at which the experiments were performed. The calculated widths are in very good agreement with those of the experimentally determined ionization potentials. By combining the experimental results with those of the calculations, the density dependence of the quasi-free electron energy in Kr was determined. These results are compared to those obtained in previous experiments and with recent theoretical calculations. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.470636
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  • 7
    Electronic Resource
    Electronic Resource
    Infrared radiation from bending magnet edges in an electron storage ring : The 9th National conference on synchrotron radiation instrumentation (1996)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 67 (1996), S. 3346-3346 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The infrared radiation emitted by electrons entering or exiting a storage ring bending magnet, which is termed "edge'' radiation, is computed. The numerical results are in agreement with experimental observations at a wavelength of 1 μm. A comparison is made with the infrared synchrotron radiation emitted from the central region of a bending magnet for wavelengths of 1 μm–1000 μm. The flux of the edge radiation is lower than that of the synchrotron radiation for the shorter wavelengths studied, and greater for the longer wavelengths. However, the brightness of the edge radiation is higher for all of the wavelengths studied. This suggests that edge radiation may be a promising infrared radiation source. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1147455
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  • 8
    Electronic Resource
    Electronic Resource
    Computer control of the SRC high-resolution beamline : 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. 1671-1673 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: We discuss the complexities of controlling the new high-resolution soft x-ray beamline at the University of Wisconsin Synchrotron Radiation Center. A monochromator at the heart of the beamline utilizes a combined rotation and translation of a variable line spaced grating to minimize major aberration terms. A rotational accuracy of 0.12 arcsec and a translational accuracy of 10 μm are required for the combined motions to obtain the desired resolution. A rotational resolution of better than 0.01 arcsec was achieved with the use of a laser interferometer and piezoelectric actuator for submicrometer feedback control. The translation control uses a linear encoder with a resolution of 0.1 μm and a motorized feedback loop. A calculation overhead of less than 100 μs for each movement was obtained by using a spline fit to approximate the rotational and translation positions to the required accuracy. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1145878
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  • 9
    Electronic Resource
    Electronic Resource
    Vacuum ultraviolet high-resolution and high-flux beamline for the Aladdin storage ring : 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. 2194-2196 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A new vacuum ultraviolet beamline for Aladdin based on an electromagnetic undulator and a 4 m normal incidence monochromator is described. The combination of the undulator, new optics, and an improved version of the currently operational monochromator is expected to deliver more than 3×1011 photons/s at a resolving power of 3×104 in the photon energy range 6–30 eV. At a lower resolving power of 104, more than 1011 photons/s will be available between 30 and 40 eV. Expecting a very high demand for the new beamline, two branches are planned to allow for time sharing. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1145703
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  • 10
    Electronic Resource
    Electronic Resource
    An insertion device beamline for 5–250 eV at the Canadian Light Source : Papers from the 12th National Synchrotron Radiation Instrumentation Conference (2002)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 73 (2002), S. 1489-1491 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: An undulator-based beamline designed to cover the energy range between 5 and 250 eV at the Canadian Light Source is described. The 8 m long monochromator is based on a spherical mirror that provides a converging beam to a variable line spacing plane grating. Three spherical mirrors and three gratings are used to cover the energy range of the beamline. A plane mirror that can be inserted into the beam before the exit slit allows diverting the beam to a second branch. The beamline is expected to deliver more than 1.5×1012 photons/s at a resolving power of 104 between 11 and 230 eV onto a spot size of less than 200 μm in diameter with low contribution of higher orders. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1436545
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