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  • 1
    Electronic Resource
    Electronic Resource
    One dimensional surface diffusion. II. Density dependence in a corrugated potential (1997)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 107 (1997), S. 6970-6979 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A kinetic theory is presented for the transport (collective) diffusion of molecules residing in a one dimensional periodic potential and relaxing to a bath formed by the substrate. Observing that the behavior of the system on a macroscopic scale cannot depend on the detailed rapidly varying motion of the molecules on the microscopic scale of the potential, and assuming that the molecules bound in the well can contribute only indirectly to the macroscopic transport, a kinetic equation for the unbound molecules is obtained. This allows one to derive an expression for the low density limit of the transport diffusion coefficient D0. In a second part of the paper the density dependence of D is studied following an Enskog-like approach, where the density dependence originates from the finite size of the molecules, combined with molecule-phonon relaxation. The density dependence is found to be the result of two effects: (i) the finite size introduces an additional contribution to the driving force, resulting in an increase of D with increasing density, (ii) the collisions of the free with the bound molecules increase the momentum loss to the substrate and result in a decrease of D. The resulting expression for D as a function of the occupancy (θ) shows under reasonable assumptions for the kinetic parameters a dependence close to 1/(1−θ), in agreement with the universal behavior observed in nanochannels of zeolites. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.474937
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  • 2
    Electronic Resource
    Electronic Resource
    On the problem of rotational-state-dependent molecule–surface interaction: Relaxation, accommodation and trapping at low J (2000)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 112 (2000), S. 8680-8686 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: In the framework of a unified kinetic theory of particle–surface interactions, dependences of the relaxation, accommodation, and trapping of molecules on their angular momentum J are discussed. One of the basic parameters of the theory, the free flight time through the interaction region, is calculated using a simple model potential for which the classical equations of motion can be integrated analytically. With increasing J, an increase in molecular relaxation and accommodation is predicted at small J, and a decrease at larger J. These results constitute a microscopically founded interpretation of recent experiments on surface light-induced drift. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.481470
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  • 3
    Electronic Resource
    Electronic Resource
    One-dimensional surface diffusion: Density dependence in a smooth potential (1997)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 107 (1997), S. 4015-4023 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A kinetic treatment of the transport of mobile molecules in nanometer channels is presented, that explores ideas of the Enskog theory of dense gases combined with molecular relaxation to the substrate. Transport diffusivity is shown to increase strongly with density, as an effect of effective transfer of mass in the nonlocal intermolecular collisions. The effect is partially compensated by the additional collisional relaxation, that would be absent in the truly one-dimensional system of hard rods, but is shown to occur in the realistic cases of quasi-one-dimensional channels and/or "soft" particles. A resulting behavior of diffusivity as a function of density close to 1/(1−θ), where θ is the degree of occupancy, is expected. This suggests an explanation for the puzzling universal behavior observed earlier in zeolites. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.474757
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  • 4
    Electronic Resource
    Electronic Resource
    Kinetic theory of rotating molecule interaction with a solid surface (1998)
    Springer
    Journal of experimental and theoretical physics 86 (1998), S. 737-744 
    Details
    ISSN: 1090-6509
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A kinetic theory of interaction between molecules with rotational degrees of freedom and a solid surface for arbitrary ratios among the times of molecule rotation, flight through the region of surface forces, and relaxation of a molecular ensemble due to phonons has been developed. A kinetic equation for an ensemble of molecules residing in the field of surface forces has been derived from the equation for the one-particle distribution function of molecules by averaging it along the dynamical trajectories in the region of surface force action. A simple analytic expression for the probability of trapping a molecule with rotational degrees of freedom has been obtained. Experimental data on rotational cooling and rotational polarization of desorbed molecules are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.558534
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  • 5
    Electronic Resource
    Electronic Resource
    Self-shielding facility for the modification of tissue and polymer films with an electron accelerator based on the rup-400 x-ray equipment (1975)
    Springer
    Atomic energy 39 (1975), S. 1115-1116 
    Details
    ISSN: 1573-8205
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01119586
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  • 6
    Electronic Resource
    Electronic Resource
    Transport phenomena in a knudsen molecular gas in a magnetic field (1979)
    Springer
    Fluid dynamics 14 (1979), S. 92-97 
    Details
    ISSN: 1573-8507
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract We consider the behavior of a strongly rarefied (Knudsen) polyatomic gas between two surfaces that have different temperatures in a magnetic field. We show that in the magnetic field H there can arise a flux of gas and a heat flux along the surfaces (odd functions in H), and also normal and tangential forces on the walls.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01050819
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  • 7
    Electronic Resource
    Electronic Resource
    “Paradoxical” circulating rarefied gas flow in a short rotating cylinder with a fixed end face (1992)
    Springer
    Fluid dynamics 27 (1992), S. 148-150 
    Details
    ISSN: 1573-8507
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01054191
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