9,801 research outputs found
Transient currents in a molecular photo-diode
Light-induced charge transmission through a molecular junction (molecular
diode) is studied in the framework of a HOMO-LUMO model and in using a kinetic
description. Expressions are presented for the sequential (hopping) and direct
(tunneling) transient current components together with kinetic equations
governing the time-dependent populations of the neutral and charged molecular
states which participate in the current formation. Resonant and off-resonant
charge transmission processes are analyzed in detail. It is demonstrated that
the transient currents are associated with a molecular charging process which
is initiated by photo excitation of the molecule. If the coupling of the
molecule to the electrodes is strongly asymmetric the transient currents can
significantly exceed the steady state current.Comment: 17 pages, 12 figures, accepted for publication in Chemical Physic
Semileptonic decays in Lattice QCD : a feasibility study and first results
We compute the decays and with finite
masses for the and quarks. We first discuss the spectral properties of
both the meson as a function of its momentum and of the and
at rest. We compute the theoretical formulae leading to the decay
amplitudes from the three-point and two-point correlators. We then compute the
amplitudes at zero recoil of which turns out not to be
vanishing contrary to what happens in the heavy quark limit. This opens a
possibility to get a better agreement with experiment. To improve the continuum
limit we have added a set of data with smaller lattice spacing. The vanishes at zero recoil and we show a convincing signal but only
slightly more than 1 sigma from 0. In order to reach quantitatively significant
results, we plan to fully exploit smaller lattice spacings as well as another
lattice regularization.Comment: 31 pages with 15 figures ; sections 5 and 6 revised and update
Novel mechanism for temperature-independent transitions in flexible molecules: role of thermodynamic fluctuations
Novel physical mechanism is proposed for explanation of
temperature-independent transition reactions in molecular systems. The
mechanism becomes effective in the case of conformation transitions between
quasi-isoenergetic molecular states. It is shown that at room temperatures,
stochastic broadening of molecular energy levels predominates the energy of low
frequency vibrations accompanying the transition. This leads to a cancellation
of temperature dependence in the stochastically averaged rate constants. As an
example, physical interpretation of temperature-independent onset of P2X_3
receptor desensitization in neuronal membranes is provided.Comment: 4 pages, 1 figur
Phase structure and confinement properties of noncompact gauge theories I
In the context of reviewing noncompact lattice gauge models at zero and
finite temperature we study in detail a contribution of the invariant measure
and the time-like plaquette configurations to correlation functions, analyze
the problem of the compactness of the potentials in respect to the confinement
and indicate the essential features to deal with the Wilson gauge theory in the
weak coupling region. A method for calculating an effective confining
noncompact model is also proposed.Comment: Latex file, 24 pages, no figure
Oxidative dehydrogenation of 2,3,5-trimethyl-1,4-hydroquinone in the presence of titanium dioxide hydrogel
Liquid-phase oxidative dehydrogenation of 2,3,5-trimethyl-1,4-hydroquinone in the presence of titanium dioxide hydrogel was studied by a kinetic method. Associative interactions between the substrate, oxidant, and gel were detected by voltammetry and ESR and IR spectroscopy.Russian Foundation for Basic Researc
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