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  • 1
    Electronic Resource
    Electronic Resource
    The f Rydberg series in the absorption spectrum of N2 (1994)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 100 (1994), S. 7957-7972 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The nf Rydberg levels of 14N2 converging to the X 2Σ+g ground state of N+2 have been studied from n=4–9 in the high-resolution absorption spectra of supersonically expanding nitrogen at wavelengths ranging from 843.2 to 802.6 A(ring) (118 600–124 600 cm−1). The best experimental results, achieving rotational temperatures on the order of 20 to 40 K and a resolution of 0.5 cm−1, were obtained by photographing the jet absorption against the background continuum from a synchrotron radiation source. Complementary data for 14N2 and 15N2 come from the analyses of spectra recorded under equilibrium conditions at 70 K with a resolution of 1 cm−1, using the He continuum as background source. The observations are interpreted with the help of multichannel quantum defect calculations and lead to the conclusion that, to varying degrees and with the exception of 4f(v=0), all the complexes studied here show the effects of interactions with core excited d and s Rydberg levels built on the A 2Πu first excited state of N+2. Also, the 9f(v=0) complex is shown to be perturbed by 10p(v=0), and the strength of the p–f interaction has been determined.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.466841
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  • 2
    Electronic Resource
    Electronic Resource
    Radius tailoring of an electron beam using a fast rise-time focusing coil: Experiment and simulation (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 3244-3249 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: An experiment demonstrating the production of a "radius-tailored beam,'' which has a larger head and smaller tail for more stable propagation through gas, using a fast rise-time focusing coil is described. The results and their analyses for the radius-tailored case, the untailored case, and the "reverse-tailored'' case are presented. A two-dimensional particle simulation of the experiment was performed for each case using the parameters of the experiment for the inputs and it produces results consistent with the experiment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.357467
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  • 3
    Electronic Resource
    Electronic Resource
    Rotational structure in the Hopfield series of N2 (1993)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 98 (1993), S. 4471-4477 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The Hopfield Rydberg series of 14N2 have been reinvestigated both at room temperature under equilibrium conditions and at a rotational temperature of ∼20 K in supersonically expanding nitrogen. High-resolution absorption spectra of the preionizing resonances in the region from 143 000 to 151 100 cm−1 have been recorded photographically as well as photoelectrically using, respectively, the 10.6 m vuv spectrograph of the National Research Council in Ottawa, Canada, and the 6.65 m scanning spectrometer at the Photon Factory synchrotron facility in Tsukuba, Japan. The photoelectric measurements have been reduced to absolute photoabsorption cross sections. The rotationally cold spectra show strikingly regular patterns of absorption peaks and window resonances that are accounted for, semiquantitatively, by the calculated total ionization cross sections for the nonrotating molecule [M. Raoult et al., J. Phys. B 16, 4601 (1983), and unpublished work by H. Le Rouzo and M. Raoult, quoted by C. H. Greene and Ch. Jungen, in Adv. At. Mol. Phys. 21, 51 (1985)]. The complexity of the room temperature spectra is rotationally induced; it does not call for an interpretation in terms of strong interactions with an unidentified perturber state as suggested by Baig and Connerade [J. Phys. B 19, L605 (1986)].
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.465006
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  • 4
    Electronic Resource
    Electronic Resource
    Absorption band oscillator strengths of N2 transitions between 95.8 and 99.4 nm (1992)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 97 (1992), S. 4809-4814 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Photoabsorption cross sections for seven electric dipole-allowed N2 bands, at wavelengths between 95.8 and 99.4 nm, have been measured with an instrumental resolution of 6.2×10−4 nm. Integrated cross sections and band oscillator strengths are presented for the c4' 1Σu+(v'=0)–X 1Σg'(v ‘=0) and c3 1Πu(v'=0)–X 1Σg+(v‘=0) transitions, as well as for five bands (v'=0,1,2,3,4) in the b 1Πu(v')–X 1Σg+(0) progression. The results are compared with earlier, lower resolution absorption measurements, electron scattering measurements, and calculations based on a deperturbation analysis of the excited states.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.463835
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  • 5
    Electronic Resource
    Electronic Resource
    Diocotron instability for relativistic non-neutral electron flow in planar magnetron geometry (1992)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 4 (1992), S. 3396-3406 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Diocotron stability properties of relativistic non-neutral electron flow in a planar magnetron are investigated within the framework of the cold-fluid-Maxwell equations. The eigenvalue equation for the extraordinary-mode waves in a relativistic velocity-sheared electron layer is obtained, and is solved in the massless, guiding-center approximation. Approximating the electromagnetic field in the anode resonator by the lowest-order mode, the dispersion relation for the diocotron instability is obtained. Although the tenuous beam approximation is assumed, the eigenvalue equation and corresponding dispersion relation are both fully electromagnetic, and valid for relativistic electron flow. The dispersion relation is numerically investigated for a broad range of system parameters. From numerical calculations of the dispersion relation, it is shown that the typical growth rate of the diocotron instability indicates a strong instability. The early evolution of the diocotron instability as an important precursor to the evolution of the full magnetron oscillation is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.860395
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  • 6
    Electronic Resource
    Electronic Resource
    Vacancy self-diffusion in a screw dislocation in a face-centered-cubic lattice (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 705-709 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Correlated self-diffusion in a screw dislocation in a face-centered-cubic crystal is treated with a vacancy mechanism using matrix functions that are generated to permit the length of the dislocation to approach infinity for the tight-binding approximation. The correlation factor f for positive vacancy binding to the dislocation is found to lie in the range 0.819≥f≥0.516. Previous calculations for a screw dislocation in a simple cubic structure are in the range 0.74≥f≥0.52, and are viewed as representing the differences associated with the core structure. Comparable calculations of the diffusion coefficient suggest that it becomes indefinitely large in the limit where the vacancies are tightly bound to the dislocation core but with a finite concentration in the surrounding lattice which is in agreement with similar limits for other dislocations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.345775
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  • 7
    Electronic Resource
    Electronic Resource
    Suppressed photocurrent multiple-quantum-well optical modulators by proton implantation (1992)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 60 (1992), S. 742-744 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We investigate the reduction of power dissipation in absorptive semiconductor optical modulators via reduction in photocurrent. We present experimental results for proton implantation of p-i-n-multiple-quantum-well modulators to levels of 1×1012 , 1×1013, and 1×1014 cm−2. We find that photocurrent can be significantly reduced with moderate reduction in modulation performance relative to the unimplanted device. Application to asymmetric self-electro-optic devices is demonstrated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.106555
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  • 8
    Electronic Resource
    Electronic Resource
    Strain tensor elements for misfit-strained [hhk]-oriented cubic crystals (1992)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 60 (1992), S. 1441-1443 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We calculate the strain tensor components for (hhk)-oriented cubic materials with misfit-generated strain. We assume the strained layer to be free of crystalline defects, and derive the tensor elements via minimization of the crystal strain energy with the imposed constraint that the epitaxial film remains in registry with the substrate lattice. The strain components described, both in the crystalline basis and in the basis of the growing film, are written in terms of the lattice mismatch and the growth-axis Miller indices. We show that the accommodation of misfit-generated strain produces a tetragonal distortion for all (hhk)-grown layers, and use the above results to interpret x-ray diffraction data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.107264
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  • 9
    Electronic Resource
    Electronic Resource
    Radius tailoring of an intense relativistic electron beam using a fast rise-time focusing coil (1993)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 63 (1993), S. 311-313 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A "radius-tailored'' electron beam, which is tapered with a larger head and a smaller tail, has been generated. This has been accomplished by injecting the electron beam into a fast rise-time magnetic focusing coil, so that the beam head expands while the beam body and tail are confined by the axial magnetic field. Time-resolved beam radius measurements indicate that a beam radius tailoring on the order of 3 to 1 has been achieved. This result is also in agreement with computer simulations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.110766
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  • 10
    Electronic Resource
    Electronic Resource
    Interface reaction model for process voiding in aluminum conductor lines (1991)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 59 (1991), S. 680-681 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A model is proposed to give a new account for process induced voiding in aluminum conductor lines in integrated circuits. The chemical reaction along the glass/aluminum interface is considered and yields a volume change. Simple calculations of changes in molecular volumes, using Wigner–Seitz radii and ionic radii for the silicon oxide reduction by aluminum all indicate vacancy creation in aluminum as the reduction proceeds. Aggregation of the vacancies will produce the voids noted from room-temperature anneals or storage.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.105363
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