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  • 1
    Electronic Resource
    Electronic Resource
    Predissociation of H3 n=2 Rydberg states: Product branching and isotope effects (1992)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 96 (1992), S. 8128-8135 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A translational spectroscopy technique is used to obtain predissociation kinetic energy release spectra from the lowest bound states of H3, 2s 2A'1 and 2p 2A‘2. These H@B|3 states are formed in near-resonant electron capture by 3 keV H+3 in Cs vapor. Their ground rovibrational levels are energetically about 1 eV above the H+H+H dissociation limit, thus all levels can yield both H2+H and the three-body products. The spectra contain both three-body and two-body components and are deconvoluted to obtain the branching ratios. Data obtained from two different ion sources show that the three-body/two-body ratio increases with increased rovibrational energy in the H*3. The results are compared to recent theory and with previously reported ratios from dissociative recombination of H+3. The comparison suggests that the ratio increases monotonically with the total electronic and rovibrational energy in the H@B|3. D*3 predissocation has a similar behavior. The H- and D-atom spectra from the two-body decay of HD@B|2 show that the ejected H atom is strongly favored on a per-atom basis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.462315
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  • 2
    Electronic Resource
    Electronic Resource
    Photodetachment of WO−3: The electron affinity of WO3 (1991)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 95 (1991), S. 824-827 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Photodetachment cross sections for WO−3 have been measured near the detachment threshold (3.0–3.7 eV). A fast beam of WO−3 is merged with a coaxial cw laser beam and the photodetached electrons are detected with a magnetic confinement slow electron collector. The photodetachment spectrum yields an electron affinity for WO3 of 3.33+0.08−0.15 eV, somewhat lower than values obtained in thermodynamic equilibrium measurements. In addition, a lower limit of 3.7 eV is obtained for the electron affinity of HWO4.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.461089
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  • 3
    Electronic Resource
    Electronic Resource
    Dissociative decay of NeH and NeD Rydberg states: A strong isotope effect (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 91 (1989), S. 6880-6886 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Radiative and predissociative decay of the n=2 Rydberg states of NeH and NeD is examined using translational spectroscopy to determine the c.m. kinetic energies of the dissociation fragments. The n=2 states are produced from 5 keV NeH+ and NeD+ by electron capture in Cs vapor. Expected radiative dissociation of the B 2Π state is observed in NeH, as is predissociation of the A 2Σ+. However, a surprisingly strong suppression of predissociation occurs in NeD. It is attributed primarily to a reduced overlap of the bound and continuum nuclear wave functions, and results in radiative decay. The results for both species support calculations of Theodorakopoulos et al. [J. Phys. B 20, 5335 (1987)].
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.457357
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  • 4
    Electronic Resource
    Electronic Resource
    Modulational excitation of drift waves by a beam of lower-hybrid waves (1996)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 3 (1996), S. 571-577 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The results of theoretical and experimental studies on excitation of drift waves in a tokamak plasma under the conditions of experiments on lower-hybrid (LH) plasma heating and current drive are presented. It is shown that for sufficiently strong LH pump levels the main effect resulting in the drift wave excitation is the LH wave modulational instability. It is found that the modulational excitation of long-wavelength drift oscillations (with the wavelengths exceeding the length of the LH pump wave) is described by a dispersion equation similar to the equation for the usual hydrodynamical beam instability. This allows us to treat the excitation of the long-wavelength drift waves as modulational excitation by a beam of the LH waves. The theoretical results obtained are compared with the data of the tokamak Tore Supra [Proceedings of the 12th International Conference on Plasma Physics and Controlled Nuclear Fusion, Nice, 1988 (International Atomic Energy Agency, Vienna, 1989), p. 9] experiment. Qualitative accordance of the theoretical and experimental results is demonstrated. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.871884
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  • 5
    Electronic Resource
    Electronic Resource
    Negative ion beam acceleration and transport : Proceedings of the fourth International Conference on Ion Sources (1992)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 63 (1992), S. 2774-2775 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The optimum conditions for focusing a negative ion beam are discussed. The distribution of the current between the Faraday cup and a large ring collector, surrounding this cup, has been investigated experimentally and theoretically, at constant extraction voltage (1.9 kV), with the acceleration voltage being varied in a wide range. The effects of beam space charge, negative ion temperature, and stripping are analyzed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1142801
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  • 6
    Electronic Resource
    Electronic Resource
    Turbulence reduction and poloidal shear steepening in reversed shear plasmas investigated by light scattering on Tore Supra (2001)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 8 (2001), S. 186-192 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Infrared light scattering is used to characterize turbulence during reversed shear scenario obtained by a fast current ramp-up on Tore Supra [Hoang et al., Phys. Rev. Lett. 84, 4593 (2000)]. The preformed hollow profile is freezed using ion cyclotron resonance minority heating (ICRH). Turbulence intensity is recorded to dramatically decrease during the ramp-up and to recover smoothly as the discharge is ended. Simultaneously, a confinement improvement of about 40% is achieved for about 2 s. Although the diagnostic performs a line average and the measurement is dominated by turbulence at the edge, we show that the core behavior can be deduced. Core turbulence decrease is in agreement with the effective heat diffusivity behavior. With the same optical device, the radial electric shear is deduced from the frequency spectra Doppler shift. Turbulence reduction is thus demonstrated to be correlated with the E×B shear steepening. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1330202
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  • 7
    Electronic Resource
    Electronic Resource
    The Hurst exponent and long-time correlation (2000)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 7 (2000), S. 1181-1183 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The rescaled range statistics (R/S) method is applied to the ion saturation current fluctuations measured by the Langmuir probe at the edge of Tore Supra [Equipe Tore Supra, in Proceedings of the 13th International Conference on Plasma Physics and Controlled Nuclear Fusion, Washington, 1990 (International Atomic Energy Agency, Vienna, 1991), Vol. 1, p. 549] to evaluate the Hurst exponent. Data block randomization is carried out to the data sets in order to investigate the relationship between the Hurst exponent and long-time correlation. It is observed that H is well above 0.5 in the long-time self-similar range. However, it is found that the information which leads to H〉0.5 is totally contained in the short-time correlation and no link to long times is found. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.873927
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  • 8
    Electronic Resource
    Electronic Resource
    Kelvin–Helmholtz instabilities in tokamak edge plasmas (1999)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 6 (1999), S. 3955-3965 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The parallel Kelvin–Helmholtz instability is investigated as a possible explanation for poloidal asymmetries of density fluctuations which reverse with the plasma current direction. It is shown that these modes are localized around the position where the radial gradient of parallel velocity is maximum. Two mechanisms lead to unstable Kelvin–Helmholtz modes; the acceleration of ions in a presheath and the anomalous Stringer spin-up due to asymmetries of the particle flux. Up–down asymmetries are explained by combining these two effects. Depending on the limiter configuration, the Stringer effect amplifies or weakens the flow due to presheath acceleration. This type of asymmetry reverses with the plasma current direction. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.873659
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  • 9
    Electronic Resource
    Electronic Resource
    Nonlocal k-space interaction and the rare existence of coherent structures in the tokamak edge plasma (2002)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 9 (2002), S. 1255-1261 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The relation between turbulent density fluctuations occurring at two wave numbers is investigated at the plasma edge of the Tore Supra tokamak [G. Antar et al., Plasma Phys. Controlled Fusion 41, 947 (1998)]. To achieve this goal, light scattering is used with two laser beams performing a Fourier transform about two given wave vectors. Consequently a band-pass filter is applied to the spatial turbulent density fluctuations about each wave vector. When the separation is small between the analyzing wave numbers, it is found that the cross correlation between the two channels is dominated by the autocorrelation caused by the diagnostic resolution in the wave number space. For large separations, the instrumental resolution contribution is negligible but a cross correlation amplitude of about 1% to 2% is still detected. It reflects nonlocal coupling in the k space caused by eddy organization rarely taking place. In agreement with this behavior, a rather small deviation of the probability distribution from a Gaussian is reported. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1455636
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  • 10
    Electronic Resource
    Electronic Resource
    Coupling of gas chromatography and molecular beam/mass spectrometry analytical techniques: Application to flame structure study (1999)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 70 (1999), S. 2828-2835 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A new experimental technique coupling both molecular beam and mass spectrometry (MBMS) and gas chromatography (GC) is developed to improve the analysis of low pressure reactive systems using a probe sampling procedure. The sensitivity of gas chromatography is greatly enhanced by using a compression procedure for the samples before injection into the chromatograph, and its selectivity allows one to separate isomers and to study very complex mixtures. By contrast MBMS is well suited to atoms and radical species detection. Moreover, the temperature dependence of the fragmentation pattern of heavy hydrocarbons during MBMS ionization is pointed out and it can be resolved alternatively by GC calibration. The complementarity of these two analytical techniques is demonstrated in the case of low pressure natural gas flames study. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1149803
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