54,254 research outputs found
All-electron GW calculation for molecules: Ionization energy and electron affinity of conjugated molecules
An efficient all-electron GW method and a quasiparticle
selfconsistent GW (QSGW) method for molecules are proposed in the molecular
orbital space with the full random phase approximation. The convergence with
basis set is examined. As an application, the ionization energy () and
electron affinity () of a series of conjugated molecules (up to 32 atoms)
are calculated and compared to experiment. The QSGW result improves the
GW result and both of them are in significantly better agreement with
experimental data than those from Hartree-Fock (HF) and hybrid density
functional calculations, especially for . The nearly correct energy gap and
suppressed self-interaction error by the HF exchange make our method a good
candidate for investigating electronic and transport properties of molecular
systems.Comment: 4 pages, 2 figures, 1 tabl
The Algebraic Structure of the Color Calogero-Sutherland Models
We extend the study on the algebraic structure of the color
Calogero-Sutherland models to the case of color CS model and show
that the generators of the super-Yangian can be obtained from two
loop algebras. Also, a super algebra for the SUSY CS
model is constructed.Comment: LaTeX, 13 page
Quadratic distances on probabilities: A unified foundation
This work builds a unified framework for the study of quadratic form distance
measures as they are used in assessing the goodness of fit of models. Many
important procedures have this structure, but the theory for these methods is
dispersed and incomplete. Central to the statistical analysis of these
distances is the spectral decomposition of the kernel that generates the
distance. We show how this determines the limiting distribution of natural
goodness-of-fit tests. Additionally, we develop a new notion, the spectral
degrees of freedom of the test, based on this decomposition. The degrees of
freedom are easy to compute and estimate, and can be used as a guide in the
construction of useful procedures in this class.Comment: Published in at http://dx.doi.org/10.1214/009053607000000956 the
Annals of Statistics (http://www.imstat.org/aos/) by the Institute of
Mathematical Statistics (http://www.imstat.org
Multidimensional optical fractionation with holographic verification
The trajectories of colloidal particles driven through a periodic potential
energy landscape can become kinetically locked in to directions dictated by the
landscape's symmetries. When the landscape is realized with forces exerted by a
structured light field, the path a given particle follows has been predicted to
depend exquisitely sensitively on such properties as the particle's size and
refractive index These predictions, however, have not been tested
experimentally. Here, we describe measurements of colloidal silica spheres'
transport through arrays of holographic optical traps that use holographic
video microscopy to track individual spheres' motions in three dimensions and
simultaneously to measure each sphere's radius and refractive index with
part-per-thousand resolution. These measurements confirm previously untested
predictions for the threshold of kinetically locked-in transport, and
demonstrate the ability of optical fractionation to sort colloidal spheres with
part-per-thousand resolution on multiple characteristics simultaneously.Comment: 4 pages, 2 figures. Accepted for publication in Physical Review
Letter
Tau function and Hirota bilinear equations for the Extended bigraded Toda Hierarchy
In this paper we generalize the Sato theory to the extended bigraded Toda
hierarchy (EBTH). We revise the definition of the Lax equations,give the Sato
equations, wave operators, Hirota bilinear identities (HBI) and show the
existence of function . Meanwhile we prove the validity of its
Fay-like identities and Hirota bilinear equations (HBEs) in terms of vertex
operators whose coefficients take values in the algebra of differential
operators. In contrast with HBEs of the usual integrable system, the current
HBEs are equations of product of operators involving and
.Comment: 29 pages, to appear Journal of Mathematical Physics(2010
Sensitivity of Ag/Al Interface Specific Resistances to Interfacial Intermixing
We have measured an Ag/Al interface specific resistance, 2AR(Ag/Al)(111) =
1.4 fOhm-m^2, that is twice that predicted for a perfect interface, 50% larger
than for a 2 ML 50%-50% alloy, and even larger than our newly predicted 1.3
fOhmm^2 for a 4 ML 50%-50% alloy. Such a large value of 2ARAg/Al(111) confirms
a predicted sensitivity to interfacial disorder and suggests an interface
greater than or equal to 4 ML thick. From our calculations, a predicted
anisotropy ratio, 2AR(Ag/Al)(001)/2AR(Ag/Al)(111), of more then 4 for a perfect
interface, should be reduced to less than 2 for a 4 ML interface, making it
harder to detect any such anisotropy.Comment: 3 pages, 2 figures, 1 table. In Press: Journal of Applied Physic
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