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  • 1
    Electronic Resource
    Electronic Resource
    Nearside–farside analysis of differential cross sections: Ar+N2 rotationally inelastic scattering using associated Legendre functions of the first and second kinds (1998)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 108 (1998), S. 5695-5703 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We have carried out the first nearside–farside (NF) analysis of angular scattering for molecular collisions in which the partial wave series for the scattering amplitude is expanded in a basis set of associated Legendre functions (of the first kind.) The practical implementation of the NF theory is described, which exploits in an essential way properties of associated Legendre functions of the second kind. The new concept of a restricted nearside–farside (resNF) decomposition of the scattering amplitude is introduced, which takes into account the caustic structure of the associated Legendre functions. The resNF theory is used to analyze polarization and degeneracy averaged differential cross sections for the Ar+N2 collision system, treated as an atom+rigid rotor. The resNF analysis always provides a clear physical interpretation of the scattering (except sometimes for scattering angles(approximate)0,180°) for phenomena such as diffraction oscillations, potential rainbows, and rotational rainbows, as well as more complicated interference effects. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.475979
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  • 2
    Electronic Resource
    Electronic Resource
    Nearside–farside analysis of differential cross sections: Diffraction and rainbow scattering in atom–atom and atom–molecule rotationally inelastic sudden collisions (1996)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 104 (1996), S. 2297-2311 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Nearside–farside (NF) theory, as used to understand nuclear heavy-ion differential cross sections, is applied for the first time to the angular scattering of atom–atom and atom–diatom collisions. A NF decomposition of the partial wave series (PWS) for the scattering amplitude has the following advantages: (a) it is exact, (b) it uses PW scattering matrix elements (quantum or semiclassical) as calculated by standard computer programs, (c) it is easily incorporated into existing computer programs which calculate angular distributions, (d) semiclassical techniques, such as stationary phase or saddle point integration, are not invoked for the PWS, although the semiclassical picture is still evident. A disadvantage of a NF decomposition is that it is not unique. The Fuller and Hatchell NF decompositions are used to analyze the angular scattering of four collision systems whose PWS involve Legendre polynomials: (a) atom–atom He+Ne elastic diffraction scattering, (b) atom–atom H++Ar elastic rainbow scattering, (c) atom rigid-rotator Ne+D2(j=0) →Ne+D2(j) diffraction scattering under sudden conditions so that the infinite-order-sudden (IOS) approximation is valid, (d) atom rigid-rotator He+N2(j=0)→He+N2(j) rotational rainbow IOS scattering. The utility of these two NF decompositions is assessed by comparison with results from the semiclassical complex angular momentum (CAM) representation of the scattering amplitude. This is chosen because it allows an unambiguous separation of the scattering amplitude into nearside and farside subamplitudes under semiclassical conditions. The Fuller NF decomposition, unlike the Hatchell NF decomposition, provides a physically clear explanation of the angular scattering, which always agrees with the semiclassical CAM interpretation (except for scattering angles ≈180°). The Fuller NF decomposition is therefore recommended for applications to atomic and molecular collisions. The NF theory for the decomposition of Legendre polynomials is generalized to scattering amplitudes whose PWS involve associated Legendre functions or reduced rotation matrix elements. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.470925
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  • 3
    Electronic Resource
    Electronic Resource
    A programmable prescaler for minimizing counting errors with PC-based data acquisition cards (1998)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 69 (1998), S. 1909-1913 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Many commonly used PC-based data acquisition counter boards are specified to count regularly occurring events at rates up to 7 MHz. Boards with this frequency limit begin to systematically and significantly underestimate the rate of randomly occurring events occurring at average frequencies much lower than the specified 7 MHz rate due to the dead time of the counter. This report highlights the origin of this error and describes an easily constructed prescaler circuit that permits accurate event counting at rates up to, and even exceeding, the nominal speed of the counter. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1148863
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  • 4
    Electronic Resource
    Electronic Resource
    Photovoltaic decay and its temperature dependence on amorphous silicon solar cells (1986)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 59 (1986), S. 658-659 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In the investigation of characteristics of amorphous-microcrystal combined silicon solar cells prepared by a vacuum evaporation, we found that (1) the photovoltaic voltage which decays as a function of continuous illumination time satisfies the Scher–Montroll function [Phys. Rev. B 12, 2455 (1975)] derived from stochastic hoping model and (2) the steady-state photovoltage as a function of temperature is found to be described by an empirical function of Vogel–Fulcher [Phys. Z. 22, 645 (1921); J. Am. Ceram. Soc. 8, 339 (1925)].
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.336629
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  • 5
    Electronic Resource
    Electronic Resource
    Nearside–farside analysis of differential cross sections using Jacobi functions of the first and second kinds: Application to Ar+N2 rotationally inelastic scattering (2001)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 114 (2001), S. 5194-5206 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We report the first nearside–farside (NF) analysis of angular scattering for an inelastic molecular collision in which the partial wave series for the scattering amplitude is expanded in a basis set of reduced rotation matrix elements dmf,miJ(θ), where θ is the scattering angle, J is the total angular momentum quantum number, and mi,mf are initial and final helicity quantum numbers, respectively. The practical implementation of the NF theory is described in detail; it exploits in an essential way the properties of a function that we denote emf,miJ(θ) and call a reduced rotation matrix element of the second kind. The caustic structure of dmf,miJ(θ) and emf,miJ(θ) is taken into account via a restricted nearside–farside (resNF) decomposition of the scattering amplitude. The resNF theory is used to analyze polarization and degeneracy averaged differential cross sections for the Ar+N2(ji=2,mi=0,±1,±2)→Ar+N2(jf=2,mf=0,±1,±2) collision system, treated as an atom+rigid-rotor. The resNF analysis always provides a clear physical interpretation of the scattering (except sometimes for θ(approximate)0°,180°) for phenomena such as diffraction oscillations and potential rainbows, as well as for more complicated (unnamed) interference effects. We also report results for some approximations to the resNF theory. Mathematical properties of the emf,miJ(θ) required for the resNF analysis are derived. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1335658
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  • 6
    Electronic Resource
    Electronic Resource
    A molecular beam apparatus for eigenstate-resolved studies of gas-surface reactivity (2000)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 71 (2000), S. 42-53 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A new supersonic molecular beam-surface scattering apparatus permits eigenstate-resolved measurements of gas-surface reactivity. Infrared light from a narrow-bandwidth tunable laser intersects a supersonic molecular beam and prepares an ensemble of molecules in a single rotational and vibrational quantum state. The energized molecules, with their well-defined translational, vibrational, and rotational energies, pass into an ultrahigh vacuum chamber and impinge on a single crystal metal surface where their reactivity is quantified. The apparatus provides independent control over translational, vibrational, and rotational degrees of freedom and permits highly detailed studies of gas-surface reactivity. In this article we describe the design and characterization of our apparatus and illustrate its use to study the dissociative chemisorption of methane on Ni(100). © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1150158
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  • 7
    Electronic Resource
    Electronic Resource
    Complex angular momentum theory of molecular collisions: New phase rules for rotationally inelastic diffraction scattering in atom–homonuclear diatomic molecule collisions (1993)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 98 (1993), S. 2947-2961 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: New phase rules have been derived for the rotationally inelastic diffraction scattering of an atom with a homonuclear diatomic molecule. The phase rules are obtained by applying semiclassical complex angular momentum techniques to the infinite order sudden approximation. The new phase rules are of three types, which are denoted weak coupling, intermediate coupling, and strong coupling. Higher-order terms have been derived for each type of phase rule. A systematic computational study of the accuracy of the phase rules has been carried out for a deformed inverse power potential energy of the form ε[r(γ)/r]n, n≥3, where r(γ)=r0+r2P2(cos γ). Additional calculations are reported for the Ne–D2 and He–N2 collision systems, using more realistic interaction potential energies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.464123
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  • 8
    Electronic Resource
    Electronic Resource
    A neutrino (antineutrino)-induced four lepton event
    Amsterdam : Elsevier
    Physics Letters B 78 (1978), S. 505-509 
    Details
    ISSN: 0370-2693
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0370-2693(78)90498-7
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  • 9
    Electronic Resource
    Electronic Resource
    Controls on the accumulation of coal and on the development of anastomosed fluvial systems in the Cretaceous Dakota Formation of southern Utah (1992)
    Oxford, UK : Blackwell Publishing Ltd
    Sedimentology 39 (1992), S. 0 
    Details
    ISSN: 1365-3091
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: Alluvial strata of the Cretaceous Dakota Formation of southern Utah are part of a transgressive systems tract associated with a foreland basin developed adjacent to the Sevier orogenic belt. These strata contain valley fill deposits, anastomosed channel systems and widespread coals. The coals constitute a relatively minor part of the Dakota Formation in terms of sediment volume, but may represent a substantial amount of the time represented by the formation. The coals are separated by clastic units up to 20 m thick.The stratigraphically lowest clastic unit of the Dakota Formation lies above an unconformity cut into Jurassic rocks. Incised valleys associated with the unconformity are up to 12 m deep. Two discrete episodes of valley fill sedimentation are recognized, including a lower sandstone unit with conglomerate layers, and an upper, discontinuous, coal-bearing unit. After the valleys filled, the area became one of low relief where extensive mires formed. Peat accumulation was interrupted at least three times by deposition of clastic sediment derived from the west.The clastic units consist of sandstone, mudstone or heterolithic ribbon bodies, stacked tabular sandstones, and laminated mudstones, and contain minor coal beds less than 0·35 m thick. Ribbon bodies are 1–9 m thick and 15–160 m wide, have pronounced basal scours, and are filled with both lateral and vertical accretion deposits. An anastomosed channel complex is suggested by the large number of coeval channels of varying dimensions, the variation in the structure and grain size of channel fills, and the presence of abundant tabular sandstones interpreted as crevasse splays. Although some sandstone bodies have well developed lateral accretion surfaces, the overall ribbon geometry indicates that mature meandering streams were not well developed. This is in contrast to modern anastomosed systems, which are commonly thought to be a transitional morphology caused by avulsion of a meander belt to a new position on its floodplain. Rather than being a transitional channel pattern related to river avulsion, the anastomosed channels of the Dakota Formation may have formed part of a large inland delta that episodically invaded widespread mires. The mires developed during periods when clastic influx was reduced either by high rates of subsidence close to the thrust belt or by deflection of rivers by emergent thrusts.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3091.1992.tb02138.x
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  • 10
    Electronic Resource
    Electronic Resource
    T-DNA-tagged chromosome 12 in donor Lycopersicon esculentum × L. pennellii is retained in asymmetric somatic hybrids with recipient Solanum lycopersicoides (1993)
    Springer
    Theoretical and applied genetics 86 (1993), S. 377-382 
    Details
    ISSN: 1432-2242
    Keywords: Asymmetric hybridization ; Cell fusion ; Lycopersicon esculentum × L. pennellii-Solanum lycopersicoides ; T-DNA tag
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Asymmetric somatic hybrid plants were recovered after fusing irradiated mesophyll protoplasts of donor Lycopersicon esculentum × L. pennellii (EP) interspecific hybrid with callus-derived protoplasts of recipient Solanum lycopersicoides. EP plant A54 had been previously transformed by an agrobacterium vector, and the T-DNA insert mapped to the L. esculentum chromosome 12. The T-DNA insert conferred kanamycin resistance to EP that was subsequently used to select cell fusion products and recover asymmetric hybrid plants that retained tagged chromosome 12. Doses of 50- and 100-Gy irradiation promoted the elimination of only a few donor chromosomes. At 200 Gy, the regenerated plants had ploidy levels higher than tetraploid. However, the T-DNA tagged chromosome 12 was always retained in the asymmetric hybrid plants tested. Likewise, all plants from the 100-Gy series, with the exception of number 160, were mixoploid in the root-tip cells. Such mixoploid asymmetric somatic hybrids could be stabilized by inducing adventitious shoots on leaf strips cultured on shoot regeneration medium containing kanamycin. The asymmetric hybrid plants did not produce viable seed when self-pollinated or backcrossed to tomato or S. lycopersicoides.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00222105
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