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  • 1990-1994  (10)
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  • 1
    Electronic Resource
    Electronic Resource
    Predissociation linewidths of the (1,0)–(12,0) Schumann–Runge absorption bands of O2 in the wavelength region 179–202 nm (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 92 (1990), S. 842-849 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A nonlinear least-squares method of retrieving predissociation linewidths from the experimental absolute absorption cross sections of Yoshino et al. [Planet. Space Sci. 31, 339 (1983)] has been applied to the (1,0)–(12,0) Schumann–Runge bands of oxygen. Predissociation linewidths deduced for the Schumann–Runge bands are larger than the theoretical predictions of Julienne [J. Mol. Spectrosc. 63, 60 (1976)] and the latest measurements of Lewis et al. [J. Quant. Spectrosc. Radiat. Transfer 36, 187 (1986)]. The larger linewidths found will have an impact on calculations of solar flux penetration into the Earth's atmosphere and of the photodissociation rates of trace species in the upper atmosphere. Systematic variation of predissociation linewidths with rotational quantum number is observed in the bands (v',0) with v'=6, 8, 9, 11, and 12.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.458117
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  • 2
    Electronic Resource
    Electronic Resource
    Predissociation of oxygen in the B 3Σ−u state (1992)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 97 (1992), S. 1787-1792 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The predissociation linewidths and level shifts of vibrational levels of three oxygen isotopic molecules 16O2, 16O18O, and 18O2 arising from the interactions of the B 3Σ−u state with the four repulsive states 5Πu, 3Σ+u, 3Πu, and 1Πu, have been calculated. A set of parameters characterizing these interactions has been determined. Good agreement between calculated and experimental predissociation widths and shifts has been obtained for all the three isotopic molecules.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.463165
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Predissociation linewidths of the (3,0)–(11,0) Schumann–Runge absorption bands of 18O2 and 16O 18O in the wavelength region 180–196 nm (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 93 (1990), S. 5539-5543 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Predissociation linewidths of the (3,0)–(11,0) Schumman–Runge bands of 18O2 and 16O 18O in the wavelength region 180–196 nm have been obtained from the published measurements of the absolute absorption cross sections of Yoshino et al. [Planet. Space Sci. 36, 1201 (1988); 37, 419 (1989)] and spectroscopic constants of these molecules of Cheung et al. [J. Mol. Spectrosc. 131, 96 (1988); 134, 362 (1989)]. The linewidths are determined as parameters in the nonlinear least-squares fitting of calculated to measured cross sections. Predissociation maxima are found at upper vibrational levels with v'=4, 7, and 10 for 18O2 and for 16O 18O. Our predissociation linewidths are mostly greater than previous experimental values for both isotopic molecules.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.459623
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  • 4
    Electronic Resource
    Electronic Resource
    Erratum: "Radio frequency forces and wave helicity'' [Phys. Fluids B 5, 3590 (1993)] (1994)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 1 (1994), S. 805-805 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.870778
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  • 5
    Electronic Resource
    Electronic Resource
    Fracture of metal-polymer line structures. II. Rigid-rodlike polyimide (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 5143-5148 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The fracture behavior of the Au/Cr line structures formed on a rigid-rodlike polyimide, biphenylenetetracarboxylic dianhydride-phenylenediamine (BPDA-PDA), film substrate has been investigated using a stretch deformation technique and compared with that of the Au/Cr line structures formed on a semiflexible polyimide, pyromellitic dianhydride-oxydianiline. In general, the effects of metal line dimensions on the deformation behavior can be attributed to the changes in the mechanical environment induced by metal confinement at the line interface. This gives rise to a fracture behavior and geometrical dependence of these two polyimide structures which are qualitatively similar in most aspects. However, the fracture energy and crack propagation rate of these two polyimide line structures are quantitatively different, with values about twice higher for the BPDA-PDA line structures. This cannot be accounted for solely by the different chemical bonding; instead, the high fracture toughness of the BPDA-PDA structure has to be attributed to its superior mechanical properties, particularly its plastic deformation characteristics, which are related to its molecular structure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.357228
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  • 6
    Electronic Resource
    Electronic Resource
    Fracture of metal-polymer line structures. I. Semiflexible polyimide (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 5136-5142 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The fracture characteristics of metal/polymer line structures formed by depositing Au/Cr lines on a semiflexible polyimide, pyromellitic dianhydride-oxydianiline (PMDA-ODA), substrate have been investigated using a stretch deformation technique. The delamination behavior, fracture morphology, fracture energy, and energy dissipation rate have been determined as a function of line width and thickness. The metal dimension was found to influence the crack formation mode and morphology. The experimental studies were supplemented by finite-element analysis to evaluate the stress distribution and deformation energetics of the line structure, which takes into account the plastic deformation of the metal and the polymer. Results from this analysis show that the observed fracture characteristics can be attributed to the edge and thickness effects induced by metal confinement. Essentially, the deformation behavior is determined by the mechanical environment induced by metal confinement at the interface. Plastic deformation of both metal and polymer plays an important role in controlling the stress distributions as well as the deformation energetics. The fracture energy of the metal-polyimide interface determined by an overall energy balance method was consistent with that obtained from energy dissipation rate. The average value is 25 J/m2 for the Au/Cr/PMDA-ODA line structure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.357227
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  • 7
    Electronic Resource
    Electronic Resource
    Interactions of three strands in joints made by RecA protein (1993)
    s.l. : American Chemical Society
    Biochemistry 32 (1993), S. 13146-13155 
    Details
    ISSN: 1520-4995
    Source: ACS Legacy Archives
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/bi00211a025
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  • 8
    Electronic Resource
    Electronic Resource
    Radio-frequency (rf) forces and wave helicity transport (1993)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 5 (1993), S. 3590-3595 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A kinetic theory is developed which unifies the concept of radio-frequency (rf) current drive and wave helicity injection. It is shown that wave helicity injection and transport can be incorporated into the more general concept of rf forces. Moreover, the part related to wave helicity has the same form as a mean field dynamo. Present result suggests that the evaluation of rf current drive by conventional methods may leave out some important effects. The theory may also simplify the study of rf influence on transport and stability.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.860830
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  • 9
    Electronic Resource
    Electronic Resource
    Electromagnetic effects in fluctuations of nonequilibrium plasmas and applications to alpha diagnostics (1991)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 3 (1991), S. 1374-1380 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A generalized fluctuation–dissipation theorem is obtained for current and density correlation spectrum of a nonequilibrium plasma. Although normally significant density fluctuations occur in only electrostatic modes, the fast mode in the lower-hybrid range of frequencies gives an exceptional example in which the mode is nontrivially electromagnetic, and yet the density fluctuations are comparable to the slow mode, which is well approximated by electrostatic approximation. This fact has quite important implications on the scattering of electromagnetic waves by nonequilibrium plasmas such as fusion plasmas with energetic α particles. It makes microwave scattering a more plausible scheme for α diagnostics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.859702
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  • 10
    Electronic Resource
    Electronic Resource
    Coupling of the fringing fields of an ion-Bernstein wave antenna (1991)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 3 (1991), S. 159-166 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: It is proposed that the fringing field of the Faraday screen of an ion–Bernstein wave antenna can couple to a short wavelength electrostatic mode and cause significant parasitic loading. The mixed boundary value problem is solved analytically and numerically. The characteristics of the resulting parasitic loading are described and relevance to experiments is described.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.859933
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