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  • 1
    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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  • 2
    Electronic Resource
    Electronic Resource
    Langmuir probe technique for plasma parameter measurement in a medium density discharge (1986)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 57 (1986), S. 2210-2217 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The development of a microcomputer-controlled electrostatic probe as a diagnostic technique is described. The technique uses cylindrical probes and the definitive theory of Laframboise to give rapid measurements of the plasma parameters in a medium density (1010 to 1012 cm−3) plasma including the fast electron density and temperature. The iterative technique described overcomes many of the problems associated with established methods of Langmuir probe analysis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1138684
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  • 3
    Electronic Resource
    Electronic Resource
    The Langmuir probe as a diagnostic of the electron component within low temperature laser ablated plasma plumes (1999)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 70 (1999), S. 1801-1805 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A Langmuir probe has been used as a diagnostic of the temporally evolving electron component within a laser ablated Cu plasma expanding into vacuum, for an incident laser power density on target similar to that used for the pulsed laser deposition of thin films. Electron temperature data were obtained from the retarding region of the probe current/voltage (I/V) characteristic, which was also used to calculate an associated electron number density. Additionally, electron number density data were obtained from the saturation electron current region of the probe (I/V) characteristic. Electron number density data, extracted by the two different techniques, were observed to show the same temporal form, with measured absolute values agreeing to within a factor of 2. The Langmuir probe, in the saturation current region, has been shown for the first time to be a convenient diagnostic of the electron component within relatively low temperature laser ablated plasma plumes. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1149672
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  • 4
    Electronic Resource
    Electronic Resource
    Time-resolved optical emission and electron energy distribution function measurements in rf plasmas (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 72 (1992), S. 1290-1296 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Comparisons between experimentally measured time-dependent electron energy distribution functions and optical emission intensities are reported for low-frequency (100 and 400 kHz) radio-frequency driven discharges in argon. The electron energy distribution functions were measured with a time-resolved Langmuir probe system. Time-resolved optical emissions of argon resonance lines at 687.1 and 750.4 nm were determined by photon-counting methods. Known ground-state and metastable-state excitation cross sections were used along with the measured electron energy distribution functions to calculate the time dependence of the optical emission intensity. It was found that a calculation using only the ground-state cross sections gave the best agreement with the time dependence of the measured optical emission. Time-dependent electron density, electron temperature, and plasma potential measurements are also reported.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.351735
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  • 5
    Electronic Resource
    Electronic Resource
    Emission studies of the plume produced during YBa2Cu3O7 film production by laser ablation (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 1138-1144 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The optical plume emissions produced on excimer laser ablation of a YBa2Cu3O7 target are reported and identified with the various atomic, ionic, and molecular species present. The spatial and temporal distribution of these emissions were studied as a function of the laser fluence and oxygen pressure. At the laser fluences used (4–6 J/cm2) some target material is ablated or evaporated directly in molecular form. In addition efficient formation of molecular oxides is observed at the contact front of the expanding plume with the surrounding oxygen atmosphere. The intensity and spatial distribution of oxide emission in the visible plume therefore provides a sensitive diagnostic for optimization of substrate location and deposition conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.356498
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  • 6
    Electronic Resource
    Electronic Resource
    A quantitative investigation of emission from low temperature laser-induced YBa2Cu3Ox plasma plumes (1995)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 77 (1995), S. 6572-6580 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Quantitative emission spectroscopy has been used to study the plume formed following laser ablation of YBCO in an oxygen atmosphere. Excited state population distributions, determined from emission line intensity ratios, are used to investigate spatiotemporal variations in the local Boltzmann temperatures for both neutral and ionic species within the expanding plume. Temperatures, obtained from emission line intensity ratios of both Cu(I) and Y(I), decrease slowly and nonadiabatically in the range 1.0–0.5 eV during plume expansion. Higher initial Boltzmann temperatures of ∼3 eV are however obtained from the emission line intensity ratios of fast ions, which dominate the composition of the highly luminous expanding front of the plume. Quantitative comparison of emission intensities for the different neutral species present indicate that the neutral composition in the luminous region of the expanding plume is increasingly dominated by Cu(I) which has a faster expansion velocity and lower oxidation rate than Y(I) and Ba(I). © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.359529
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  • 7
    Electronic Resource
    Electronic Resource
    Time-resolved electron energy distribution function measurements in a pulsed magnetic multipole hydrogen discharge (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 3461-3466 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The time evolution of measured plasma parameters, including the electron energy distribution function (EEDF), in the discharge and post-discharge regime of a pulsed hydrogen magnetic multipole plasma is presented. The time necessary for the plasma to reach equilibrium has been established as 160 μs. The present results clarify the mechanisms which initiate the discharge. The decay rates of the charged-particle density and energy in the post-discharge have been measured. These measurements indicate that particle transport to the wall is the dominant loss mechanism for both charged-particle density and energy. The time-resolved EEDF is found to be non-Maxwellian in the discharge and Maxwellian in the late post-discharge.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.348531
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  • 8
    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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  • 9
    Electronic Resource
    Electronic Resource
    Automatic Langmuir probe plasma diagnostic (1987)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 58 (1987), S. 475-476 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The hardware implementation of a computer-based Langmuir probe technique is described. The technique, which is applicable in a wide range of dc plasma conditions, allows a full range of plasma parameters to be measured efficiently.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1139256
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  • 10
    Electronic Resource
    Electronic Resource
    Plasma parameters of a radio frequency discharge : International conference on ion sources (1990)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 61 (1990), S. 448-450 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A low-frequency (100 kHz) radio frequency discharge has been characterized by making time-resolved measurements of the basic plasma parameters, including the electron energy-distribution function. Measurements obtained when operating with H2, D2, and Ar are compared. Surprisingly low electron temperatures (∼0.2 eV) have been found in H2 and D2 discharges.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1141269
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