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  • 1
    Electronic Resource
    Electronic Resource
    Generation of acidic sites in metal salts of heteropoly acids (1983)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 87 (1983), S. 2406-2411 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100236a033
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  • 2
    Electronic Resource
    Electronic Resource
    Photophysics of some substituted diphenylmethylenes (1983)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 87 (1983), S. 4426-4433 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100245a021
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  • 3
    Electronic Resource
    Electronic Resource
    Two-color multiphoton dissociation and ionization of ferrocene (1986)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 90 (1986), S. 2888-2892 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100404a021
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  • 4
    Electronic Resource
    Electronic Resource
    Atomic iron recoil in multiphoton dissociation of ferrocene (1986)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 90 (1986), S. 2892-2896 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100404a022
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  • 5
    Electronic Resource
    Electronic Resource
    Role of Eu2+ luminescent centers in the electro-optical characteristics of red-emitting CaS:Eu thin-film electroluminescent devices with memory (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 68 (1990), S. 3578-3583 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In order to investigate the role of the Eu2+ luminescent centers in determining the electro-optical characteristics of red-emitting CaS:Eu thin-film electroluminescent (TFEL) devices with inherent memory, light irradiation effects on these characteristics were studied. Both the threshold voltage and the response time decreased by light irradiation at wavelengths of 400–600 nm. This wavelength region coincides with that of the direct-excitation spectrum of Eu2+. Furthermore, emission peak height at the trailing edge of the pulse drive voltage increased by light irradiation in the same wavelength region. Since this emission is assumed to be caused by recombination of diffusing electrons with holes located at the ionized Eu2+ luminescent centers, increase in the emission peak height at the trailing edge of the pulse drive voltage indicated an increase in the number of the ionized Eu2+ luminescent centers. From these arguments we conclude that ionized Eu2+ luminescent center is a possible source of positive space-charge, which is known to play a decisive role in the memory and response characteristics of TFEL devices.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.346317
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  • 6
    Electronic Resource
    Electronic Resource
    Slow response and Eu2+-related trapping states in CaS:Eu thin-film electroluminescent devices (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 5018-5024 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In order to clarify causes of the slow buildup of the optical output, i.e., slow optical response, in red-emitting CaS:Eu thin-film electroluminescent devices, Eu2+ concentration and temperature dependence of the response time of transferred electrons were measured. It was found that the response time increased exponentially with the increase in Eu2+ concentration and temperature. To understand these results, trapping states in CaS:Eu phosphor layer were studied by measuring temperature dependence of the following electro-optical characteristics with Eu2+ concentration as a parameter; (i) decay profile of trapped electrons, (ii) photoluminescent intensity, and (iii) photoinduced charge density. From these measurements, it was found that there existed two kinds of shallow states in the band gap of CaS. One was electron trapping states located at approximately 0.15 eV below the conduction-band minimum. These states were considered to be generated by Eu2+ clusters. The other was located at 0.06–0.08 eV below the conduction-band minimum. These states were considered to be 5d-excited states of isolated Eu2+ activators. Based on these experimental results, an energy band model for CaS:Eu thin film was proposed and causes for the slow optical response were discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.349006
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  • 7
    Electronic Resource
    Electronic Resource
    Electro- and photo-luminescent quenching effects imposed by field-induced ionization of the Eu2+ luminescent centers in CaS:Eu thin films (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 7225-7230 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: It is found that both the high-field electroluminescent (EL) and photoluminescent intensities of CaS:Eu thin films were quenched by an applied electric field. This quenching was found to be caused by a field-induced ionization of impact-excited Eu2+ luminescent centers. This ionization was known to play an important role in the memory and slow response characteristics of CaS:Eu thin-film electroluminescent devices. Evidence for field-induced ionization of Eu2+ was obtained from the following measurements of CaS:Eu; (i) the first and second EL emission peaks, (ii) photoluminescence, and (iii) photocapacitance.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.347617
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  • 8
    Electronic Resource
    Electronic Resource
    Ultra-high-beta spherical tokamak formation by use of an oblate field-reversed configuration : The 41st annual meeting of the division of plasma physics of the american physical society (2000)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 7 (2000), S. 1863-1869 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A new slow formation of oblate field-reversed configuration (FRC) has been developed in the Tokyo University Spherical Torus No. 3 (TS-3) merging experiment using two merging spheromaks with opposing toroidal field. This unique technique was extended to a novel formation of ultra-high-beta (50%–70%) spherical tokamak (ST) by applying an external toroidal field Bt,ext to the FRC so produced. The high-beta ST was found to have a diamagnetic toroidal field in sharp contrast with low-beta STs with strong paramagnetic toroidal fields. High-beta properties of FRCs including their hollow current profile were maintained during the equilibrium transition, suggesting a close relationship between FRCs and high-beta STs in the second stability regime. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.874009
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  • 9
    Electronic Resource
    Electronic Resource
    Experimental investigation of three-component magnetic reconnection by use of merging spheromaks and tokamaks : The 38th annual meeting of the Division of Plasma Physics (DPP) of the American Physical Society (1997)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 4 (1997), S. 1953-1963 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A laboratory experiment of magnetic reconnection has been developed in the Tokyo University Spherical Torus (TS-3) [Y. Ono et al., Phys. Fluids B 5, 3691 (1993)] merging device, using two colliding plasma toroids with cohelicity and counterhelicity. The conventional two-component reconnection was extended experimentally to three-component reconnections by introducing a new field component BX parallel to the X-line, an external force and a reconnection-driven global equilibrium transition. Selective ion heating accompanied by a field-aligned jet was documented during the counterhelicity reconnection without BX, indicating its direct energy-conversion into the ion thermal energy. Ion heating, current-sheet resistivity and reconnection rate all increase significantly with decreasing BX and with increasing the external force, indicating three-component and driven effects of reconnection. The anomalous sheet-current dissipation and the ion heating are both found to depend on whether the current-sheet is compressed shorter than the ion gyroradius or not. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.872337
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  • 10
    Electronic Resource
    Electronic Resource
    Experimental investigation on tilt stabilizing effect of external toroidal field in low aspect ratio tokamak (1997)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 4 (1997), S. 315-322 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: This paper describes experimental investigations on the equilibrium and global stability of low aspect ratio tokamaks with different aspect ratios ranging from 1.1 to 1.9. The Z-θ pinch spheromak formation technique is used to produce low aspect ratio tokamaks in an external toroidal field generated by the center conductor. Using this operation, the plasma stability has been investigated in the transition regime from tokamaks to spheromaks. It has been found that there exists a lower critical value of the center conductor current to surpress the global plasma instability of the n=1 tilt and/or shift modes. The ratio of this critical current to plasma current is experimentally measured for the first time as a function of the aspect ratio. Glass-tube cylindrical limiters with different radii are installed along the symmetric center axis of the Spherical Torus-3 device [Y. Ono et al., Phys. Fluids B 5, 3691 (1993)]. As the aspect ratio is decreased from 1.9 to 1.1, it is observed that the critical ratio of the center conductor current to plasma current decreases from 1.2 to 0.2. The safety factor q at the plasma edge corresponding to this critical current is roughly 1.5 to 3.0. Similar experiments are also carried out with a thin metal cover surrounding the surface of the glass tube limiter. The thin metal cover permits the decrease in the critical current and the corresponding edge q value of q∼1. These experimental results of the critical current ratio are found to be comparable to that predicted from theoretical models where the restoring force against the tilt motion is considered to be generated by the interaction of the external toroidal field with the n=1 induced surface currents in the tilt motion. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.872092
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