2,738 research outputs found
Enhancement of Vibronic and Ground-State Vibrational Coherences in 2D Spectra of Photosynthetic Complexes
A vibronic-exciton model is applied to investigate the mechanism of
enhancement of coherent oscillations due to mixing of electronic and nuclear
degrees of freedom recently proposed as the origin of the long-lived
oscillations in 2D spectra of the FMO complex [Christensson et al. J. Phys.
Chem. B 116 (2012) 7449]. We reduce the problem to a model BChl dimer to
elucidate the role of resonance coupling, site energies, nuclear mode and
energy disorder in the enhancement of vibronic-exciton and ground-state
vibrational coherences, and to identify regimes where this enhancement is
significant. For a heterodimer representing the two coupled BChls 3 and 4 of
the FMO complex, the initial amplitude of the vibronic-exciton and vibrational
coherences are enhanced by up to 15 and 5 times, respectively, compared to the
vibrational coherences in the isolated monomer. This maximum initial amplitude
enhancement occurs when there is a resonance between the electronic energy gap
and the frequency of the vibrational mode. The bandwidth of this enhancement is
about 100 cm-1 for both mechanisms. The excitonic mixing of electronic and
vibrational DOF leads to additional dephasing relative to the vibrational
coherences. We evaluate the dephasing dynamics by solving the quantum master
equation in Markovian approximation and observe a strong dependence of the
life-time enhancement on the mode frequency. Long-lived vibronic-exciton
coherences are found to be generated only when the frequency of the mode is in
the vicinity of the electronic resonance. Although the vibronic-exciton
coherences exhibit a larger initial amplitude compared to the ground-state
vibrational coherences, we conclude that both type have a similar magnitude at
long time for the present model. The ability to distinguish between
vibronic-exciton and ground-state vibrational coherences in the general case of
molecular aggregate is discussed.Comment: 16 pages, 6 figure
A Simple Nickel Catalyst Enabling an E‐Selective Alkyne Semihydrogenation
Stereoselective alkyne semihydrogenations are attractive approaches to alkenes, which are key building blocks for synthesis. With regards to the most atom economic reducing agent dihydrogen (H 2 ), only few catalysts for the challenging E ‐selective alkyne semihydrogenation have been disclosed, each with a unique substrate scope profile. Here, we show that a commercially available nickel catalyst facilitates the E ‐selective alkyne semihydrogenation of a wide variety of substituted internal alkynes. This results in a simple and broadly applicable overall protocol to stereoselectively access E ‐alkenes employing H 2 which could serve as a general method for synthesis.DFG, 352364740, Diwasserstoff-vermittelte nachhaltige BindungsknüpfungsreaktionenTU Berlin, Open-Access-Mittel - 201
Percolation thresholds and fractal dimensions for square and cubic lattices with long-range correlated defects
We study long-range power-law correlated disorder on square and cubic
lattices. In particular, we present high-precision results for the percolation
thresholds and the fractal dimension of the largest clusters as function of the
correlation strength. The correlations are generated using a discrete version
of the Fourier filtering method. We consider two different metrics to set the
length scales over which the correlations decay, showing that the percolation
thresholds are highly sensitive to such system details. By contrast, we verify
that the fractal dimension is a universal quantity and unaffected
by the choice of metric. We also show that for weak correlations, its value
coincides with that for the uncorrelated system. In two dimensions we observe a
clear increase of the fractal dimension with increasing correlation strength,
approaching . The onset of this change does not seem to
be determined by the extended Harris criterion.Comment: 12 pages, 8 figure
Self-thinning and Community Persistence in a Simple Size-structured Dynamical Model of Plant Growth
This paper presents a size-structured dynamical model of plant growth. The model takes the form of a partial differential-integral equation and includes the effects of self-shading by leaves. Closed form solutions are presented for the equilibrium size density distribution. Analytic conditions are derived for community persistence, and the self-thinning exponent is obtained as a function of species characteristics and environmental conditions
Quark core formation in spinning-down pulsars
Pulsars spin-down due to magnetic torque reducing its radius and increasing
the central energy density. Some pulsar which are born with central densities
close to the critical value of quark deconfinement may undergo a phase
transition and structural re-arrengement. This process may excite oscillation
modes and emmit gravitational waves. We determine the rate of quark core
formation in neutron stars using a realistic population synthesis code.Comment: Proceedings of the 2nd International Workshop on Astronomy and
Relativistic Astrophysics, to appear in IJMP
Stereoselective alkyne semihydrogenations with an air-stable copper(I) catalyst
An air-stable and preactivated copper(I) hydroxide/N-heteroyclic carbene (NHC) complex for alkyne semihydrogenations is reported. Next to an enhanced practicability of the process, the resulting alkenes are obtained with high Z-selectivities and no overreduction to the corresponding alkanes
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Theoretical and paleoclimatic evidence for abrupt transitions in the Earth system
Specific components of the Earth system may abruptly change their state in response to gradual changes in forcing. This possibility has attracted great scientific interest in recent years, and has been recognized as one of the greatest threats associated with anthropogenic climate change. Examples of such components, called tipping elements, include the Atlantic Meridional Overturning Circulation, the polar ice sheets, the Amazon rainforest, as well as the tropical monsoon systems. The mathematical language to describe abrupt climatic transitions is mainly based on the theory of nonlinear dynamical systems and, in particular, on their bifurcations. Applications of this theory to nonautonomous and stochastically forced systems are a very active field of climate research. The empirical evidence that abrupt transitions have indeed occurred in the past stems exclusively from paleoclimate proxy records. In this review, we explain the basic theory needed to describe critical transitions, summarize the proxy evidence for past abrupt climate transitions in different parts of the Earth system, and examine some candidates for future abrupt transitions in response to ongoing anthropogenic forcing. Predicting such transitions remains difficult and is subject to large uncertainties. Substantial improvements in our understanding of the nonlinear mechanisms underlying abrupt transitions of Earth system components are needed. We argue that such an improved understanding requires combining insights from (a) paleoclimatic records; (b) simulations using a hierarchy of models, from conceptual to comprehensive ones; and (c) time series analysis of recent observation-based data that encode the dynamics of the present-day Earth system components that are potentially prone to tipping
Leapfrogging Kelvin waves
Two vortex rings can form a localized configuration whereby they continually pass through one another in an alternating fashion. This phenomenon is called leapfrogging. Using parameters suitable for superfluid helium-4, we describe a recurrence phenomenon that is similar to leapfrogging, which occurs for two coaxial straight vortex filaments with the same Kelvin wave mode. For small-amplitude Kelvin waves we demonstrate that our full Biot-Savart simulations closely follow predictions obtained from a simplified model that provides an analytical approximation developed for nearly parallel vortices. Our results are also relevant to thin-cored helical vortices in classical fluids
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