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  • 1
    Electronic Resource
    Electronic Resource
    The A + B .fwdarw. 0 Reaction under Short-Range Interactions (1994)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 98 (1994), S. 7256-7259 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100081a004
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  • 2
    Electronic Resource
    Electronic Resource
    Fluctuation-dominated A+B→0 kinetics under short-ranged interparticle interactions (1996)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 105 (1996), S. 6304-6314 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: In the present paper we analyze the kinetics of irreversible A+B→0 reactions in situations appropriate to electrolyte solutions. We consider diffusing species which experience short-range repulsive (attractive) interactions between like (unlike) particles and we highlight the role of fluctuations in the particles' spatial distributions. We focus mainly on one-dimensional systems and devise a many-particle description of the reaction kinetics. In terms of our analytical approach we show that at intermediate times the interplay between fluctuations and short-ranged interactions gives rise to unusual behaviors, characterized by novel dynamical exponents of the particles' mean concentrations. For batch reactions at longer times, when the concentrations drop off significantly, the usual fluctuation-induced behavior is recovered. We also analyze systems with external, steady sources of particles and we show that in such situations the effects of the interactions become decisive at long times. Our analytical findings are in good agreement with the results of numerical simulations, which we also present. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.472466
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  • 3
    Electronic Resource
    Electronic Resource
    Kinetics of the A+B→0 reaction under steady and turbulent flows (1996)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 105 (1996), S. 10925-10933 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We consider the kinetics of the two-dimensional, stoichiometric A+B→0 reaction under external flows, for which we use two models: First a steady flow, which consists of an array of eddies; second a time-dependent, stochastic flow which mimics turbulent fluid motion. We follow the reaction numerically and detect in both situations complex decay patterns, which obey different power-laws at short, intermediate and long times: While the initial stage of the reaction is dominated by mixing, c(t)∝t−1, the long-time behavior shows fluctuation-dominated kinetics, c(t)∝t−1/2. In the case of the eddy-lattice-flow a very slow intermediate regime, with c(t)∝t−1/4, emerges. This regime is explained in the framework of an analytical model for mixing along closed-flow lines. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.472896
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  • 4
    Electronic Resource
    Electronic Resource
    Exact enumeration of all conformations of a heteropolymer chain in a prescribed, non-compact volume (1997)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 106 (1997), S. 7829-7833 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We study the protein structure problem in a prescribed, non-compact volume (with a hole). The choice of such a volume offers the advantage of being closer in structure to real proteins. Using an exact enumeration technique we investigate the thermodynamic properties of the chain's configurations. These findings are compared to the results obtained for fully compact structures, such as the 3×3×3 cube. Interestingly we find here deviations from the random energy model. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.473741
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  • 5
    Electronic Resource
    Electronic Resource
    Cyclization of a polymer with charged reactive end groups (2001)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 114 (2001), S. 5043-5048 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We calculate the cyclization rate k(t) of a single polymer chain with charged end groups, where cyclization takes place with probability of one when the ends approach each other at a distance smaller than the reaction radius R. Using Monte Carlo simulations in a kink-jump model we show that the long-time asymptotic value of k for longer chains and attractive Coulomb interaction does not depend on R, but depends strongly on the Onsager radius, which characterizes the strength of electrostatic interaction. This result relies only on the large-scale behavior of the chain and is reproduced within a simple harmonic-spring approximation. The harmonic-spring model leads to a diffusion equation which is solved numerically. The solution for long chains is confirmed with analytical approximations. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1348273
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  • 6
    Electronic Resource
    Electronic Resource
    Mobility and lifetime of negative charges in liquid H2 (1995)
    Springer
    The European physical journal 98 (1995), S. 437-438 
    Details
    ISSN: 1434-6036
    Keywords: 67.90.+z ; 72.20.Jv
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Recent experiments on the mobility ofe − in liquid H2 have shown features that differ drastically from those of liquid He, although the adopted theories for such mobilities are quite similar. The differences are attributed to the existence of a second type of charge carriers (different from bubbles), namely H−(H2) x -clusters. The effective radius and the decay channels of these carriers are investigated theoretically.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01338421
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  • 7
    Electronic Resource
    Electronic Resource
    Optical pumping in a L-system by parametric luminescence light (1997)
    Springer
    Journal of experimental and theoretical physics 85 (1997), S. 73-86 
    Details
    ISSN: 1090-6509
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We examine the optical pumping effect in an ensemble of three-level atoms with a Λ configuration of the energy sublevels excited by parametric luminescence light in the squeezed state. We derive quantum kinetic equations that describe the evolution of the density matrix of atoms irradiated by low-intensity squeezed light with a finite-width spectrum. In particular, we show that because of the quantum statistical properties of the squeezed light there can be a redistribution of atoms among the lower energy sublevels, despite the equality of the intensities of the spectral components of the light that resonantly excites optical transitions in the Λ-system. The relation of the optical pumping effect to the correlation and spatial-temporal spectral properties of squeezed light is discussed in detail. Finally, we show that the effects are closely linked to the finiteness of the width of the squeezed-light spectrum.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.558318
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  • 8
    Electronic Resource
    Electronic Resource
    Inhomogeneous broadening of electronic transitions in a liquid helium bubble: The role of shape fluctuations (1993)
    Springer
    Journal of low temperature physics 90 (1993), S. 319-330 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Recent experiments of Grimeset al. [Phys. Rev. B 41, 6366 (1990)] and Parshinet al. [JETP,74, 68 (1992)] demonstrate a substatial broadening in the 1s-1p transition of a single electron trapped in a liquid helium bubble (“bubblonium”) compared to theoretical predictions based on natural radiative linewidth. We show that the larger observed linewidth can be explained by inhomogeneus broadening due to quantum quadrupole fluctuations in the bubble shape. A simple adiabaticity rule for the bubblonium transitions similar to the Franck-Condon principle for molecular transitions is established. Quantitative estimates of the additional inhomogeneous linewidth atT=0 and 2.2 K are provided. The full theoretical linewidth, due to inhomogeneous and homogeneous broadening, has a Voigt-profile shape, and accounts for the data reasonably well.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00682005
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  • 9
    Electronic Resource
    Electronic Resource
    The mobility of negative charges in liquid hydrogen (1994)
    Springer
    Journal of low temperature physics 95 (1994), S. 683-694 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract There is a great difference in behavior of e− in liquid hydrogen and helium despite the fact that the adopted theories of the mobility are quite similar. Recently, Levchenko and Mezhov-Deglin (Journal of Low Temperature Physics,89, 457 (1992)) reported large discrepancies of the mobility of the electrons in liquid hydrogen from estimates based on the theory that the electrons are trapped in bubbles forming atomlike structures (“bubblonium”). They properly suggested that these deviations are related to the existence in liquid hydrogen of another, metastable type of negative charge carrier. The subject of the current paper is the physical explanation of the existence of two types of carriers in liquid hydrogen. We attribute the second type of carriers to the cluster ionH − (H 2 ) x , which is created by the formation of solid hydrogen around a bound state of a hydride ion. We provide estimates for the radius and the kinetics of degradation of the “snowball” formed around theH − ion on the basis of energy diagrams for a hydride ion submerged in liquid hydrogen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00754710
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  • 10
    Electronic Resource
    Electronic Resource
    Fluctuation-dominated kinetics in the a+b→0 reaction between immobile particles (1991)
    Springer
    Journal of statistical physics 65 (1991), S. 849-857 
    Details
    ISSN: 1572-9613
    Keywords: A+B→0 ; fluctuation-dominated kinetics ; immobile particles ; black-sphere model ; interactions with cutoff
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We consider the accumulation of immobile particles landing on a one-dimensional lattice and annihilating via the A + B → 0 bimolecular reaction. Here we focus on short-range interactions with cutoff. We investigate through computer simulations both the kinetics of the particles' accumulation and also their spatial distribution. The relation between the exponents describing the growth of the particles' concentration and the correlation length of their distribution shows that the kinetics of accumulation is fluctuation-dominated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01049585
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