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  • Articles  (27)
  • 1985-1989  (27)
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  • 1
    Electronic Resource
    Electronic Resource
    Excitation energy dependent photochemistry near the carbon K edge in polymer films (1985)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 89 (1985), S. 2235-2237 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100257a018
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  • 2
    Electronic Resource
    Electronic Resource
    Evidence for valence hole localization in the Auger decay and fragmentation of carbon and silicon tetrafluorides (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 90 (1989), S. 2162-2166 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Monochromatic synchrotron radiation was used to excite selectively core electrons of the carbon and fluorine atoms in carbon tetrafluoride and silicon and fluorine in silicon tetrafluoride. The fragmentation processes were examined using time-of-flight mass spectroscopy. The mass spectra show the distribution of ions collected in coincidence with low and high energy electrons. Distinct changes in the mass spectra with atomic site of excitation and photon energy are observed. The observation of F2+ ions following fluorine 1s excitation in SiF4 provides significant evidence for a "valence bond depopulation'' mechanism involving the formation of a localized, two-hole final state that persists on the time scale of fragmentation. In contrast, no F2+ was observed for CF4, which indicates that fragmentation for this molecule is more characteristic of a delocalized two-hole state.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.456011
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  • 3
    Electronic Resource
    Electronic Resource
    Optical luminescence excitation spectra of molecular oxygen in the soft x-ray region (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 89 (1988), S. 1215-1218 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The observation of an anomaly in the optical luminescence excitation spectrum of oxygen in the region of the oxygen K edge is reported. Dispersed luminescence spectra were obtained for x-ray excitation at the pi and sigma resonances, at the anomaly, and in the continuum. These spectra indicate enhanced production of O2+2 ions at both the sigma resonance and at the anomaly. The anomaly thus is attributed to a shake-up or shake-off state associated with an antibonding sigma molecular orbital of oxygen. This work also demonstrates that optical luminesence spectra provide state-specific information about the products of core hole excitation and relaxation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.455172
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  • 4
    Electronic Resource
    Electronic Resource
    Efficient x-ray production from ultrafast gas-puff Z pinches (1985)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 57 (1985), S. 830-833 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The Proto-II accelerator has been used to implode krypton and xenon annular gas puffs. A significant fraction of the machine electrical energy was converted first to plasma kinetic energy and then to x rays when the plasma pinched on axis. Quantitative measurements using time-resolved bolometers have shown as much as 10% of the total radiation yield near 1 keV in Xe and 2 keV in Kr. We have compared this radiation yield to the predictions from one-dimensional magnetohydrodynamic code calculations. The implosions were also observed with both time-integrated pinhole cameras and spectrographs. No hard x-ray (E〉10 keV) output was observed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.334734
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  • 5
    Electronic Resource
    Electronic Resource
    Photoconducting x-ray detectors for Z-pinch experiments (1988)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 59 (1988), S. 1804-1806 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: We have used GaAs and GaAs:Cr photoconducting detectors (PCDs) to measure the absolute x-ray output from 1 to 10 keV from Z-pinch plasma radiation sources. We calibrated the detectors over the spectral range of 900–3000 eV and found the spectral response to be constant to within the accuracy of the measurements. The flat spectral response, increased sensitivity (compared with bolometers), and good time response of the PCDs, coupled with their reliability and long lifetimes, have allowed us to acquire absolute x-ray data of significantly higher quality than possible with resistive bolometers or x-ray diodes (XRDs). An added attraction of PCDs is their smooth saturation at high incident x-ray fluxes. Unlike other types of electrical x-ray detectors, this feature allows a PCD to operate over a wide range of incident x-ray powers (10–104 W/cm2 ). We present results from gas puff Z-pinch experiments on Proto-II and Supermite comparing PCD, XRD, and resistive bolometer performance.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1140118
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  • 6
    Electronic Resource
    Electronic Resource
    Radiation diagnostics for x-ray laser experiments on Proto-II (1986)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 57 (1986), S. 2195-2195 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: X-ray laser experiments on the Sandia Proto-II accelerator (10 TW, 40-ns FWHM, 0.125 Ω) use a wide array of radiation diagnostics. Precise x-ray measurements are difficult in the environment of a large pulsed power accelerator. Machine shock, EMP, and large x-ray fluences are significant problems. X-ray diodes and resistive bolometers provide excellent time-resolved information. Crystal and grazing-incidence grating spectrographs and x-ray pinhole cameras give time-integrated data. A recent major effort at Sandia has been the development of time-resolved x-ray pinhole cameras, crystal spectrographs, and grazing-incidence spectrographs. These diagnostics use microchannel plates or a scintillator and streak camera system to obtain time resolution. Precise alignment, nanosecond time resolution, and high spectral precision are all needed for successful x-ray laser experiments. We will present descriptions of the diagnostics and data taken on recent x-ray laser experiments. This work was supported by the U.S. DOE.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1138730
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  • 7
    Electronic Resource
    Electronic Resource
    Precision ozone calibration system based on vapor pressures of ozone (1987)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 58 (1987), S. 1063-1066 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A precision ozone calibration system for stratospheric research has been developed and evaluated. Vapor pressures above solid ozone are mixed with a carrier gas (N2) to produce stratospheric ozone mixing ratios at total pressures of 1 to over 20 Torr. The uncertainty in the ozone mixing ratios is approximately ±1.5%, the stability of ozone is ±0.3%. Experiments to be calibrated may sample the gas mixture over a wide range of flow rates; the maximum throughput of gas with corrections of less than 1% to ozone is about 200 Torr l/min. A mass spectrometer system continuously monitors the purity and stability of the N2–O3 gas mixture.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1139608
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  • 8
    Electronic Resource
    Electronic Resource
    Fragmentation of acetone following excitation in the region of the oxygen K edge (1987)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 86 (1987), S. 4442-4445 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The fragmentation of acetone following excitation in the region of the oxygen K edge was studied by time-of-flight mass spectroscopy. By comparing mass spectra obtained using various photon energies ranging from below to well above the threshold for oxygen 1s excitation, it is found that methyl ion production is strongly associated with excitation of an oxygen 1s electron. None of the excitations generated significant yields of atomic oxygen or carbon ions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.452717
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  • 9
    Electronic Resource
    Electronic Resource
    Chemistry of acetylene exposed to alumina and alumina-supported rhodium catalysts (1986)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 108 (1986), S. 3884-3888 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja00274a004
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  • 10
    Electronic Resource
    Electronic Resource
    Fractal-like triplet state energy transfer kinetics in doped polymer films (1987)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 86 (1987), S. 1586-1592 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The time evolution of the donor phosphorescence following pulsed laser excitation is used to monitor direct energy transfer at 16 K between the triplet states of donor molecules (4,4'-dibromobenzophenone) and acceptor molecules (1,4-dibromonaphthalene) doped into polymer films (polystyrene). The correspondence between the experimental data and the theoretical description provided by Inokuti and Hirayama is not satisfactory. Better agreement between theory and experiment is obtained by introducing an improved configuration average, which is valid at higher concentrations, and a nonuniform density of acceptor sites, which is a consequence of the polymer structure. The nonuniform density reveals a fundamental difference between the properties of a small molecule glass and a polymer glass. This difference can be quantified by the effective fractal dimension, which equals 3 for the small molecule glass and is found to equal 2.2 for this system.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.452197
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