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  • 1985-1989  (10)
  • 1960-1964  (15)
  • 1
    Electronic Resource
    Electronic Resource
    Dynamic dipole polarizability of a dielectric sphere in an electrolyte (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 89 (1988), S. 3823-3829 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The response of a suspension of spherical particles to a periodic electric field is given by the real and imaginary part of the effective dielectric number εeff(ω). In order to describe its dispersion within an enhanced dipole residual interaction model, the polarizability α(ω) of a single sphere has to be found first. This calculation is facilitated by the smallness of the ratio of the Debye length δ to the radius a of the sphere. In a thin double layer approximation, an improved expansion in δ/a is found for α(ω) in the long wavelength limit k→0. In contrast to Schwarz (Ref. 1) who assumed tangential diffusion effects around the spheres, the volume diffusion is the dominant feature here. A comparison with a simple relaxation time ansatz is given in order to show the significance of diffusion.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.454857
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  • 2
    Electronic Resource
    Electronic Resource
    Double differential cross sections for alkali–Hg collisions in the 100 eV range. I. Time-of-flight measurements (1986)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 85 (1986), S. 2738-2750 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Differential cross sections with energy analysis have been measured for Na, K, and Cs atoms scattered from Hg for collision energies between 36 and 200 eV. The energy analysis is performed with standard time-of-flight technique yielding the cross sections for elastic scattering and scattering with excitation of the lowest alkali P state. The cross sections for all other excited states are found to be smaller by several orders of magnitude. A new semiempirical potential model is described which has been used to interpret the experimental results. Parameters for the best fit to our results are given in this two-state model for K and Cs. For Na we can only give a coarse estimate. Some serious failures of the semiclassical theory have been discovered, which have lead us to the use of quantum mechanical calculations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.451030
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  • 3
    Electronic Resource
    Electronic Resource
    Cluster expansion in density for the dielectric constant of a colloidal model suspension (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 89 (1988), S. 3830-3835 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: In order to describe the dielectric response of a dense suspension of polarizable spherical particles to an external low frequency field one has to find an appropriate expansion in density. Beyond the Clausius–Mossotti formula, which only is a mean field ansatz, a cluster expansion (Ref. 1) takes account of the interaction between particles. The one-particle–dipole polarizability being given, the terms up to second order in density including two-particle interaction can be calculated. With the help of this enhanced dipole-residual-interaction model the dispersion (low frequency response) of colloidal suspensions can be discussed more thoroughly than before.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.454858
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  • 4
    Electronic Resource
    Electronic Resource
    ON THE LOW-FREQUENCY DIELECTRIC DISPERSION OF COLLOIDAL PARTICLES IN ELECTROLYTE SOLUTION1 (1962)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 66 (1962), S. 2626-2635 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100818a066
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  • 5
    Electronic Resource
    Electronic Resource
    Investigation of the K(2S, 2P)–Hg interaction at collision energies between 0.5 and 6 eV (1986)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 84 (1986), S. 181-191 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Measurements of total differential cross sections for the scattering of laser-excited K(4 2P3/2) atoms by ground state mercury atoms have been performed in a crossed beam experiment at center-of-mass energies between 0.5 and 6 eV. Characteristic features of the cross section are two well resolved rainbow structures which we can assign to the ∑ and the Π branch of the excited state potential in the scope of the elastic approximation. At energies above 2.1 eV we observe an additional structure in the cross section at large angles which shows the same dependence on the polarization as the amplitude of the ∑ rainbow. This is attributed to a shoulder in the repulsive part of the B ∑ potential. The simultaneously measured differential cross sections for the scattering of K(2S) atoms by mercury have been used to determine the repulsive portion of the ground state potential by inversion, making use of the precisely known well of the potential for this system.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.450168
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  • 6
    Electronic Resource
    Electronic Resource
    Röntgenstrahlenhemmung der Glukose- und Brenztraubensäure-Oxydation in Bacterium cadaveris (1962)
    Springer
    Naturwissenschaften 49 (1962), S. 326-327 
    Details
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00602201
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  • 7
    Electronic Resource
    Electronic Resource
    Effektive Stoßquerschnitte bei Streuversuchen (1962)
    Springer
    The European physical journal 166 (1962), S. 406-428 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Scattering experiments are often not performed with the ideal set-up consisting of a monochromatic beam and target particles at rest. This is, for instance, never the case in molecular beam scattering, which is of primary interest in this paper. Two arrangements are normally employed, one consisting of a gas chamber as target (case a), the other of a crossed beam, generally at right angles to the incoming beam (case b). In both cases the scattering particles have a Maxwellian velocity distribution. This means that in any such experiment an “effective cross section” is measured, which is an integral over cross sections for different collision velocities. Other similar integrals are needed, if one works with polarized beams and takes into account the fact that the cross section is angular dependent. A third type of integral is required, when the primary beam is not monochromatized, and one has to average over its velocity distribution too. The functions needed to interpret scattering experiments of all the types mentioned are given in this paper, as well as a table of values for the 24 most important of these functions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01384175
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  • 8
    Electronic Resource
    Electronic Resource
    Numerische Berechnungen zum Resonanzverhalten der Streuquerschnitte bei atomaren Stößen. II (1964)
    Springer
    The European physical journal 177 (1964), S. 146-150 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The undulatory behavior in the velocity dependence of the total elastic cross-sectionQ(v) for atom-atom-scattering can be calculated by the semiclassical approximation. In a previous paper J numerical values of the classical deflection function, which are necessary to evaluate the amplitude of the extrema inQ(v), were reported for a Kihara-potential as a function of the reduced energyK and the potential parameter α. The present paper gives the correspondent reduced maximum phase shiftsη 0 * (K,α), which determine the location of the extrema. The results for the Kihara-potential are compared with similar calculations for a Lennard-Jones-(n, 6)-potential.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01375331
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  • 9
    Electronic Resource
    Electronic Resource
    Differentielle Streuquerschnitte bei der Wechselwirkung neutraler Moleküle (1963)
    Springer
    The European physical journal 171 (1963), S. 349-370 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract An apparatus to measure differential scattering cross sections using crossed molecular beams is described and results for the scattering of potassium atoms by different heavy atoms and molecules are presented. The experimental data are compared with theoretical calculations for a Buckingham-(exp-six)-potential and the parameters of this potential are determined. To carry out this comparison, it was necessary to average the existing calculations of E. A.Mason over the Maxwellian velocity distribution in the potassium beam. These averaged differential cross sections are tabulated for various angles and temperatures in the appendix of the present paper. Using crossed beams of molecules containing halogens, we can observe chemical reactions. Methods to determine total and differential reaction cross sections are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01380655
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  • 10
    Electronic Resource
    Electronic Resource
    Numerische Berechnungen zum Resonanzverhalten der Streuquerschnitte bei atomaren Stößen. I (1963)
    Springer
    The European physical journal 175 (1963), S. 227-234 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The semiclassical approximation can be used to calculate the extrema in the energy dependence of the total cross section for collisions between neutral atoms and molecules. For this treatment, the classical deflection functionΘ(β) must be known in the region nearβ 0, where it passes smoothly through 0° (glory scattering). Numerical values forβ 0,Θ′ (β 0) andΘ′' (β 0), which determine the amplitude of the extrema, are presented for aKihara (12,6) potential for various reduced energiesK (0.01≦K≦100) and potential parameters α (−0,3≦α≦0.5).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01375100
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