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  • 1
    Electronic Resource
    Electronic Resource
    Nonspectator electron processes in resonant Auger spectra of SiCl4 (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 89 (1988), S. 4490-4493 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Angle-resolved photoelectron spectroscopy has been carried out on the valence shell of SiCl4 over the range of photon energies from 101.5 to 112.5 eV. Both intensities and angular distribution parameters β were monitored over the preionization resonances for silicon 2p. Little effect was seen for emission from the chlorine lone-pair orbitals 2t1 , 8t2 , and 2e, but striking effects were seen for the bonding 7t2 orbital. The resonant behavior was compared with photoabsorption data. The results are discussed in terms of direct participation of the resonantly excited electron and this process compared with spectator electron and shakeup processes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.454788
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  • 2
    Electronic Resource
    Electronic Resource
    Monte Carlo simulation of charged-particle-analyzer line shapes (1986)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 57 (1986), S. 2780-2785 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A Monte Carlo simulation method is presented for calculating line shapes for charged-particle analyzers with cylindrical symmetry. Either isotropic or cosine angular distributions of charged-particle emission can be simulated. Application of this technique is demonstrated by simulation of the line shape exhibited by the Helmer planar-retarding-grid analyzer. Ray tracing is used to determine the origin of line-shape asymmetry, new entrance optics are designed, and subsequently, a simulation is used to optimize the dimensions of the analyzer apertures and beam stop to produce a symmetric nearly Gaussian line shape. This result is then verified experimentally. Although the simulation method is applied to a specific problem, it should prove to be of value for the design of any analyzer having axial symmetry.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1139042
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  • 3
    Electronic Resource
    Electronic Resource
    Retarding-field differential-output energy prefilter for high-performance secondary ion mass spectrometry (1985)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 56 (1985), S. 1557-1563 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A retarding-field differential-output energy prefilter has been optically matched to a quadrupole mass spectrometer to produce a high-performance secondary ion quadrupole mass spectrometer. The sample area was designed to be field free to allow for sample charge compensation and to prevent secondary ion trajectories from being affected by electric fields. Design considerations for optically matching the energy prefilter to the quadrupole mass filter (QMF) are discussed. The overall transmission of the instrument was 1.8×10−4 at a mass resolution of 100 M/ΔM (1–100 amu range) for copper and 1.7×10−5 at a mass resolution of 400 M/ΔM (10–250 amu range) for tungsten.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1138152
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  • 4
    Electronic Resource
    Electronic Resource
    Autoionization between the ionization thresholds for the 2Π3/2 and 2Π1/2 states of HI+ (1986)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 84 (1986), S. 4755-4759 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Angle-resolved photoelectron spectroscopy was carried out on hydrogen iodide using synchrotron radiation. Applying the constant ionic state (CIS) method, studies were made on resonances associated with autoionization between the ionization potential for the two spin-orbit split lone pair orbitals, π3/2 and π1/2. Data on both partial cross sections and angular distribution parameters, β, were obtained for the production of the first ionic state 2Π3/2 (v=0). These data indicate the presence of several series of Rydberg states leading to the second ionization potential 2Π1/2 (v=0). Both broad and sharp resonances were observed. A detailed comparison of the data is made with a MQDT calculation in the range of 10.6 to 10.73 eV. Although theory predicts some of the features correctly, there is much room for improvement. Results on the first excited vibrational state [2Π3/2 (v=1)] are also presented and the effects of vibrational states are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.449959
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  • 5
    Electronic Resource
    Electronic Resource
    Shape resonances in the angle-resolved photoelectron spectroscopy of the Si 2p shell of SiCl4 (1986)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 84 (1986), S. 122-126 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The partial cross sections and angular distribution parameters, β, have been determined for the 2p subshell in SiCl4. These data were obtained with angle-resolved photoelectron spectroscopy and the use of synchrotron radiation for a range of photon energies from 114 to 150 eV. The same quantities were calculated by use of a multiple scattering Xα method, and the agreement between experiment and theory is very good. In particular, the behavior of shape resonances was well predicted. The nature of shape resonances as a function of molecular orbitals in SiCl4 is discussed, and the importance of such intercomparison is emphasized.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.450186
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  • 6
    Electronic Resource
    Electronic Resource
    Angle-resolved photoelectron spectroscopy of the valence orbitals of SiCl4 as a function of photon energy from 14 to 80 eV (1986)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 84 (1986), S. 641-648 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Angle-resolved photoelectron spectroscopy coupled with synchrotron radiation have been used to measure partial cross sections and angular distribution parameters, β, from a photon energy of 14 to 80 eV for SiCl4. Parallel to these measurements, calculations have been made using the continuum multiple scattering Xα method. The results have been examined, primarily in terms of the phenomena of the Cooper minimum and shape resonances. Minima in both the cross sections and β values were found for each of the first five orbitals of SiCl4: 2t1, 8t2, 2e, 7t2, and 7a1. These minima were examined for their energy positions and, in the case of the β values, the depth of the minimum. Shape resonances were calculated in the photoionization of each of the orbitals, and a number of experimental features due to shape resonances are identified. The results, both experimental and theoretical, are compared with earlier work on CC14.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.450557
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