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  • 1
    Electronic Resource
    Electronic Resource
    Ab initio analysis of the electron-phonon interaction in silicon (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 4378-4383 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A Harris functional approach is used to investigate the electron-phonon interaction in silicon, within the rigid ion approximation. The necessary lattice dynamics are solved via the valence shell model. The electron-phonon matrix elements for transitions between selected electronic states are calculated, and equivalent deformation potentials are presented and compared with results of other models. The resulting deformation potentials exhibit significant dispersion throughout much of the Brillouin zone, though remain nearly constant for intervalley transitions between states close to the conduction band minima. The overall value of the deformation potentials is somewhat higher than found in previous models and thus in better agreement with experiment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.352801
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  • 2
    Electronic Resource
    Electronic Resource
    Microcomputer interface board for time-resolved multichannel scaling (1987)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 58 (1987), S. 1530-1532 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A low-cost multichannel scaler and signal-averaging system with user selectable channel widths ranging from 1 to 255 μs has been developed for molecular beam time-of-flight (TOF) experiments. It has the ability to collect up to 255 channels and has a programmable delay of up to 0.65 s. On-board logic can accommodate a 15-MHz count rate. Completely contained on a 7×2 3/4 -in. Apple II prototyping board (with the exception of a 5-A, 5-V external power supply), the interface fits into a peripheral port of the Apple II. The interface was tested by measuring the TOF distribution of Ar metastables from a supersonic nozzle beam source.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1139393
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  • 3
    Electronic Resource
    Electronic Resource
    Surface far-ultraviolet photochemistry of ethyl chloride on gallium arsenide (100) (1993)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 97 (1993), S. 2262-2269 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100112a030
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  • 4
    Electronic Resource
    Electronic Resource
    Product rotational alignment in the excitation transfer reaction Ar(3P2)+N2→Ar+N2(C 3Πu) (1987)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 87 (1987), S. 5830-5839 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The velocity dependence of the N2(C) rotational alignment from the title excitation transfer reaction was studied over the collision energy range 42–460 meV, using a beam-gas time-of-flight method. The alignment was found to be positive, and to increase approximately linearly with energy: the extrapolated line has a large positive intercept, suggesting that the alignment persists down to zero energy. The present results, together with previous studies of this reaction, are consistent with a model in which the reaction occurs preferentially in the plane of rotation of the N2. It is suggested that this steric effect is due primarily to the orbital overlap requirements of the electron exchange mechanism. The polarization of the fluorescence from the dissociative excitation reactions of Ar*+CS2, Ar*+H2O, Kr*+CS2, and Xe*+BrCN was also measured and found to be zero at all velocities.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.453506
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  • 5
    Electronic Resource
    Electronic Resource
    Reactions of metastable argon with photodissociation aligned carbon disulfide: A study of the steric dependence of two competing reaction channels (1987)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 86 (1987), S. 2653-2658 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: CS2 molecules in a beam were aligned using laser photodissociation at 193 nm. Two competing reactions with metastable Ar were studied as a function of CS2 alignment. The Penning ionization reaction cross section for formation of CS+2 (X 2Πg) was found to be largest when the CS2 bond is parallel to the relative velocity vector, while the cross section for dissociative excitation giving CS*(A 1Π) is largest when the CS2 bond is perpendicular to the relative velocity vector.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.452067
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  • 6
    Electronic Resource
    Electronic Resource
    Measurement of chemiluminescence polarization as a function of collision velocity by time-of-flight spectroscopy: Reactions of Xe* with HCl, HBr, Cl2, Br2, and I2 (1986)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 84 (1986), S. 3753-3761 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A new method is described for obtaining chemiluminescence polarization as a function of reactant relative velocity, employing a beam-gas time-of-flight technique. These experiments provide information about product alignment as a function of velocity. Results are reported for the formation of xenon halide excimers from the reactions of Xe(3P2,0) with HCl, HBr, Cl2, Br2, and I2. The HX reactions give strong excimer polarization, primarily due to kinematic constraints, whereas with the X2 reactions the excimers are polarized due to the collision dynamics. In this work we have made the first observation of cases in which the products rotate preferentially in planes normal to the initial relative velocity vector. This is observed for the Xe*+Cl2 and Br2 reactions at low velocities, and is attributed to a mechanism which gives preferential repulsive energy release perpendicular to the reactant relative velocity vector. The direct interaction product repulsion (DIPR) model does not give agreement with the data, showing that a more realistic potential surface model will be necessary to explain the present results.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.450216
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  • 7
    Electronic Resource
    Electronic Resource
    The properties of CO and K co-adsorbed on Ni(111), studied by thermal desorption and metastable quenching spectroscopy (1985)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 82 (1985), S. 485-495 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We use thermal desorption and metastable quenching spectroscopy to study the (CO+K)/Ni(111) system. We find that CO and K co-adsorption increases the binding energy (to the surface) of both molecules; that at coverages of more than one potassium atom per, roughly, eight nickel atoms the adsorbed CO molecules exchange atoms; that this exchange takes place without formation of a detectable (by MQS) number of adsorbed carbon and oxygen atoms; that the 2π@B| peak in the Penning spectrum is enhanced by the presence of the potassium; that at high potassium coverages CO and K desorb at practically the same temperature giving rise to a very narrow thermal desorption peak. We discuss the spectroscopic evidence concerning the detection of the 2π* orbital. We suggest that our experiments indicate that at low potassium coverage the surface has two local work functions: one corresponds to Ni atoms unmodified by the presence of potassium, and the other to strongly modified, low work function sites.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.448771
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  • 8
    Electronic Resource
    Electronic Resource
    Condensed-matter physics Simple metals under pressure (1999)
    [s.l.] : Macmillan Magazines Ltd.
    Nature 400 (1999), S. 117-119 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The alkali metals — the monovalent elements in the first column of the periodic table — have long been regarded as prototype ‘simple metals’ with non-directional metallic bonding. This view is entrenched in the current understanding of solids, which began with the pioneering ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/22009
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  • 9
    Electronic Resource
    Electronic Resource
    Dependence of tetanic hyperpolarization on pump conductance in the cyanide-treatedXenopus node (1985)
    Springer
    Bulletin of mathematical biology 47 (1985), S. 749-755 
    Details
    ISSN: 1522-9602
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Mathematics
    Notes: Abstract Prolonged exposure to cyanide leads to a delayed but reversible disappearance of tetanic hyperpolarization in theXenopus node (G. M. Schoepfle,Am. J. Physiol. 231, 1033–1038, 1976). This effect is attributed to a pronounced decline in the absolute values of the ATP and ADP concentrations, such that the ATP-driven ion translocation is no longer possible, regardless of the existing values for (Na)i, (K)i and the (ATP)/(ADP) ratio. Mathematically, this would imply a vanishing of a constant pump conductance gp in the exression for electrogenic pump current densitityJ p, whereJ p=g p (V m −E p) in whichV m is membrane potential andE p is an ATP-and sodium-dependent e.m.f.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02469301
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  • 10
    Electronic Resource
    Electronic Resource
    Simulated tetanic hyperpolarization by sodium loading of a neuronal system in which active transport is linked to the Frankenhaeuser-Huxley equations (1983)
    Springer
    Bulletin of mathematical biology 45 (1983), S. 1013-1028 
    Details
    ISSN: 1522-9602
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Mathematics
    Notes: Abstract Tetanic hyperpolarization for theXenopus node is simulated by means of iterative solutions of the Frankenhaeuser-Huxley excitation equations together with an active transport current density term which is dependent on sodium and potassium levels as well as the ADP/ATP ratio. All time-dependent variables at the end of one interspike interval are introduced as initial conditions for the next response, whereupon all time-dependent changes in voltage and permeability factors appear identical for the third and fourth responses of a sequence. Net change in internal sodium concentration is zero throughout the third and fourth intervals if sodium loading of the system is initially adjusted to a critical level. Extent of tetanic hyperpolarization is a function of the pump conductance.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02458828
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