نتایج جستجو برای: charge radius
تعداد نتایج: 187015 فیلتر نتایج به سال:
A simple method is used to extrapolate the form factor for the process γ∗γ∗ → π when two virtual photons produce a π from the region of large spacelike photon virtualities to the experimentally accessible case when one of the photons is real. The method is also applied to the study of the axial anomaly and ω − ρ − π coupling and to the pion charge and charge radius. The results compare favourab...
© 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim 1 wileyonlinelibrary.com orbital (HOMO) and the lowest unoccupied molecular orbital (LUMO) of the individual CQDs. This inhomogeneity in electronic energy levels can disrupt the charge hopping transport in CQD fi lms and degrade the transport rate signifi cantly. In addition, a suffi ciently narrow CQD size dispersion is essential to achieve the...
In a final-focus system, space-charge forces can be significant even for very high beam energies. The reason is the inherent large chromaticity of such a system, which needs to be compensated to a high precision. The longitudinal space-charge force causes an energy variation along the bunch, which depends on beam size, beam-pipe radius, and bunch population. Since this energy variation is locat...
Detailed analysis of the coupled Dirac-Maxwell equations and the structure of their solutions is presented. Numerical solutions of the field equations in the case of spherical symmetry with negligible gravitational self-interaction reveal the existence of families of solitons with electric field dominance that are completely determined by the observed charge and mass of the underlying particles...
Accurate knowledge of the charge and Zemach radii of the proton is essential, not only for understanding its structure but also as input for tests of bound-state quantum electrodynamics and its predictions for the energy levels of hydrogen. These radii may be extracted from the laser spectroscopy of muonic hydrogen (μp, that is, a proton orbited by a muon). We measured the 2S(1/2)(F=0)-2P(3/2)(...
We discuss in this paper the phase diagram of a diblock polyampholyte solution in the limit of high ionic strength as a function of concentration and charge asymmetry. This system is shown to be very similar to solutions of so-called charged-neutral diblock copolymers: at zero charge asymmetry the solution phase separates into a polyelectrolyte complex and almost pure solvent. Above a charge as...
Extensive Monte Carlo simulations and scaling arguments are used to study the colloidal charge reversal. The critical colloidal surface charge density sigma(c) at which the reversal first appears is found to depend strongly on the ionic size. We find that sigma(c) has an inflection point as a function of the electrolyte concentration. The width of the plateau region in the vicinity of the infle...
We compare the energies of the Laughlin liquid and a charge density wave in a weak magnetic field for the upper Landau-level filling factors nN5 1 3 and 1 5. The charge-density-wave period has been optimized and was found to be .3.3Rc , where Rc is the cyclotron radius. We conclude that the optimal charge density wave is lower in energy than the Laughlin liquid for the Landau-level numbers N>2 ...
The mechanism of charge separation in polymeric bulk heterojunction photovoltaic cells is usually described as electron transfer from the absorbing polymer to an electron acceptor material such as 6,6 -phenyl C61 butyric acid methyl ester PCBM . We consider the possibility of energy transfer to PCBM as another potential mechanism for charge separation. We demonstrate resonance energy transfer f...
Curvature-driven pore growth in charged membranes during charge-pulse and voltage-clamp experiments.
We find that curvature-driven growth of pores in electrically charged membranes correctly reproduces charge-pulse experiments. Our model, consisting of a Langevin equation for the time dependence of the pore radius coupled to an ordinary differential equation for the number of pores, captures the statistics of the pore population and its effect on the membrane conductance. The calculated pore r...
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