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  • 11
    Electronic Resource
    Electronic Resource
    Quantitative absorption and fluorescence spectroscopy of BCl3 in vacuum ultraviolet (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 89 (1988), S. 6653-6657 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The absorption and fluorescence cross sections and the fluorescence quantum yields of BCl3 were measured in the 106–190 nm region. A visible emission band appears at excitation wavelengths shorter than 173 nm and two ultraviolet emission bands appear at wavelengths shorter than 126.5 nm. Fluorescence spectra were dispersed to identify emitting species that are attributed to BCl@B|2. The upper limits of the potential energies for the observed emitting states are 2.56, 5.19, and 5.70 eV, as determined from the fluorescence thresholds. The photodissociation process of BCl3 is discussed in accord with the fluorescence observed. The radiative lifetimes of the visible band vary over the 5–24 μs range, and the quenching rate constants of the excited state by BCl3 vary in (1.2–2.7)×10−10 cm3/s, both depending on fluorescence wavelength.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.455387
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  • 12
    Electronic Resource
    Electronic Resource
    CH3O(A˜–X˜) fluorescence from photodissociation of dimethyl ether (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 89 (1988), S. 6555-6557 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Photoabsorption and fluorescence cross sections of dimethyl ether, (CH3)2 O, were measured in the 110–195 nm region using synchrotron radiation as a light source. Fluorescence was observed in the 120–155 nm region with a maximum cross section of 5.5×10−19 cm2 at 137 nm. The fluorescence spectra produced at 147 and 157.5 nm were dispersed and identified to be the CH3O (A˜–X˜) transition. The radiative lifetime of CH3O*(A˜) is 1.8±0.3 μs and the quenching rate constant of CH3O(A˜) by dimethyl ether is (5.7±0.4)×10−10 cm3 /s.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.455378
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  • 13
    Electronic Resource
    Electronic Resource
    Magnetic reconnection in the presence of sheared plasma flow: Intermediate shock formation (1994)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 1 (1994), S. 706-713 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Classical models of magnetic reconnection consist of a small diffusion region, which is bounded by two pairs of slow shocks. In these models, the plasma is accelerated across the shocks. It has long been postulated that violation of symmetry across the current sheet will lead to the formation of intermediate waves in the current sheet. These asymmetries are important properties of space plasma current sheets. Equally important in space plasmas is the presence of sheared flow across current sheets. In this study, the structure of steady-state reconnection is investigated in the presence of a shear flow across the current sheet with symmetric density and magnetic field strengths using two-dimensional magnetohydrodynamic (MHD) simulations. The results show that for sheared flow above the Alfvén velocity of the inflow regions no steady-state magnetic reconnection occurs. For sheared plasma flow below this critical velocity steady-state reconnection is obtained. A detailed examination of the Rankine–Hugoniot jump conditions reveals that each pair of slow shocks is replaced by a strong intermediate shock and a weak slow shock in the presence of shear flow.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.870816
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  • 14
    Electronic Resource
    Electronic Resource
    Magnetic flux generation near an O-line in collisionless reconnection— A new dynamo process (1995)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 2 (1995), S. 3852-3856 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Magnetic reconnection in a current sheet with electron gyroradius scale is studied by a full particle simulation, in which the ion-electron mass ratio is set to be mi/me=10−1836. A new dynamo process has been found in which magnetic flux emerges outward from the magnetic O-line in the magnetic island formed by reconnection. The generation of new flux is associated with plasma compression in the magnetic island. The generated new flux is estimated to be ∼B0ρe, independent of the ion-electron mass ratio, where B0 is the magnetic field far away from the current sheet, and ρe is the electron gyroradius based on B0 and the electron thermal velocity. The plasma inertia and momentum transport due to the off-diagonal elements of plasma pressure tensor can lead to E⋅J〈0 near the magnetic O-line, which makes the dynamo process possible. It is also found that the characteristic time scales of the reconnection process have a power-law dependence on the ion-electron mass ratio. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.871084
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  • 15
    Electronic Resource
    Electronic Resource
    Electron attachment rate constants of HBr, CH3Br, and C2H5Br in N2 and Ar (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 63 (1988), S. 4905-4910 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The electron attachment rate constants of bromine compounds in the buffer gases of N2 and Ar (∼250 Torr) were measured as a function of E/N (or mean electron energy). The measured electron attachment rate constants of HBr, CH3Br, and C2H5Br show maximum values of 1.05×10−9, 1.08×10−11, and 9.3×10−11 cm3/s at mean electron energies of 0.55, 0.4, and 0.8 eV, respectively. The electron drift velocities for the gas mixtures of CH3Br in N2 and Ar were also measured.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.340431
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  • 16
    Electronic Resource
    Electronic Resource
    Two-photon-ionization coefficients of CS2, SO2, and (CH3)3N (1985)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 58 (1985), S. 3295-3301 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Electrons produced by two-photon ionization of CS2, SO2, and (CH3)3N in N2 and CH4 buffer gases at 193 nm were investigated using a parallel-plate drift-tube apparatus. At a low charge density, the transient voltage induced by electron motion between the electrodes is proportional to the gas pressure and the square of laser power. The two-photon-ionization coefficients measured from the number of electrons produced are 3.3×10−27, 8.3×10−30, and 1.7×10−27 cm4/W for CS2, SO2, and (CH3)3N, respectively. The coefficient for (CH3)3N agrees with the earlier value measured by ion current. At a high charge density, the number of electrons observed deviates from the square dependence of laser power. The numbers of ions and electrons are greatly reduced by charge recombination whose reaction rate is enhanced in the presence of space charge.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.335789
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  • 17
    Electronic Resource
    Electronic Resource
    Reply to "Comment on ‘Shortening of electron conduction pulses by electron attachers O2, N2O, and CF4' '' [J. Appl. Phys. 56, 3169 (1984)] (1986)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 60 (1986), S. 4338-4338 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: This is a reply to Hunter's comment on our papers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.337484
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  • 18
    Electronic Resource
    Electronic Resource
    Shortening of electron conduction pulses by electron attacher C3F8 in Ar, N2, and CH4 (1985)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 58 (1985), S. 184-187 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The attachment rate constants of C3F8 in the buffer gases of Ar, N2, and CH4 are measured using a parallel-plate drift-tube apparatus. The dependences of the electron drift velocities on the contents of C3F8 in various buffer gases are investigated. Electrons are produced by irradiating the cathode with ArF laser photons. The transient voltage pulses induced by the electron motion are observed. We find that the C3F8-CH4 mixture has the desirable characteristics of both electron drift velocity and attachment rate constant for the application of diffuse-discharge opening switches.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.335705
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  • 19
    Electronic Resource
    Electronic Resource
    Attachment of low-energy electrons to HCl (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 64 (1988), S. 1625-1631 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The electron-attachment rate constants of HCl diluted in Ar and N2 were measured as a function of the reduced electric field E/N. These data were converted to the electron-attachment cross section of HCl using the electron-energy distribution functions of pure Ar and N2. The dependence of the electron-attachment rate constant and the mean electron energy on the fraction of HCl in each buffer gas was investigated. A comparison of the current result with both available experimental data and theoretical calculations is made.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.341810
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  • 20
    Electronic Resource
    Electronic Resource
    Structure of field-aligned plasma jets associated with magnetic reconnection (1992)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 4 (1992), S. 3808-3810 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The structure of field-aligned plasma jets associated with magnetic reconnection is examined. It is found that the plasma jets are located slightly downstream of the magnetic separatrices and each plasma jet consists of two parts: (a) a slow-mode shock and (b) a fast-mode compressional structure. The slow shock accelerates the plasma and converts magnetic energy into flow energy and thermal energy. The fast-mode compressional wave, located immediately downstream of the slow shock, decelerates the plasma and converts part of the flow energy back into magnetic energy and thermal energy. The combined structure of slow shock and fast compressional wave leads to the formation of the narrow field-aligned plasma jet.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.860336
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