Document Detail


The ground state estimation by global optimization of an effective potential. Application to binary para-H(2)/ortho-D(2) molecular clusters.
MedLine Citation:
PMID:  20540547     Owner:  NLM     Status:  PubMed-not-MEDLINE    
Abstract/OtherAbstract:
It is demonstrated how the problem of ground state estimation of an n-body system can be recast as the less demanding problem of finding the global minimum of an effective potential in the 3n-dimensional coordinate space. The latter emerges when the solution of the imaginary-time Schrödinger equation is approximated by a variational Gaussian wavepacket (VGW). The VGW becomes stationary in the infinite-imaginary-time limit. Such a stationary solution is not only exact for a harmonic potential, but it also provides a good approximation for a quantum state that is still localized in one of the basins of attraction, when, for example, the harmonic approximation may fail. The landscape of the effective potential is favorable for its global optimization, and is particularly suitable for optimization by GMIN, an open source program designed for global optimization using the basin-hopping algorithm. Consequently, the methodology is applied within GMIN to estimate the ground state structures of several binary para-H(2)/ortho-D(2) molecular clusters. The results are generally consistent with the previous observations for homogeneous para-H(2) and ortho-D(2) clusters, as well as for smaller binary clusters.
Authors:
Jason Deckman; Vladimir A Mandelshtam
Related Documents :
16133887 - Semiparametric methods for clustered recurrent event data.
15323477 - In situ studies of monosaccharide gelation using the small-angle x-ray scattering time-...
10673407 - Testing population synthesis models with globular cluster colors.
750627 - A stochastic locomotor control model for the nurse shark, ginglymostoma cirratum.
22683397 - How are asthmatics included in the derivation of guideline values for emergency plannin...
22208197 - Accurate flexible fitting of high-resolution protein structures to small-angle x-ray sc...
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  The journal of physical chemistry. A     Volume:  114     ISSN:  1520-5215     ISO Abbreviation:  J Phys Chem A     Publication Date:  2010 Sep 
Date Detail:
Created Date:  2010-09-09     Completed Date:  2011-01-11     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9890903     Medline TA:  J Phys Chem A     Country:  United States    
Other Details:
Languages:  eng     Pagination:  9820-4     Citation Subset:  -    
Affiliation:
Chemistry Department, University of California at Irvine, Irvine, California 92697, USA.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Descriptor/Qualifier:

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


Previous Document:  Theoretical Investigation on the Stability of Negatively Charged Formic Acid Clusters.
Next Document:  Spatiotemporal Dynamics of Mixed Landolt Systems in Open Gel Reactors: Effect of Diffusive Feed.