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Essential dynamics for the study of microstructures in liquids.

Maira D'Alessando1, Andrea Amadei, Mauro Stener

  • 1Dipartimento di Scienze Fisiche e Chimiche, Universita' di l'Aquila, Via Vetoio s.n.c., 67100 l, 'Aquila, Italy.

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|December 25, 2014
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Summary

Essential Dynamics (ED) analysis is extended to study atomic and supramolecular clusters. This computational method enables unbiased conformational studies of local microstructures in liquids, validated with liquid water simulations.

Keywords:
clusterscomputational spectroscopyconformational samplingessential dynamicsmolecular dynamics

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Area of Science:

  • Computational Chemistry
  • Molecular Dynamics Simulations
  • Physical Chemistry

Background:

  • Essential Dynamics (ED) is a standard method for analyzing molecular dynamics (MD) simulations, primarily for large systems like proteins and nucleic acids.
  • Current applications of ED are limited, particularly for systems involving weakly interacting particles such as atomic clusters and supramolecular assemblies.

Purpose of the Study:

  • To extend the applicability of Essential Dynamics (ED) to analyze clusters of arbitrary size composed of weakly interacting particles.
  • To develop a method for identifying relevant atomic-molecular clusters for ED analysis to extract specific information.
  • To enable straightforward and unbiased conformational studies of local microstructures in liquids using computational approaches.

Main Methods:

  • Extension of Essential Dynamics (ED) methodology to arbitrary-sized clusters of weakly interacting particles.
  • Development of a key feature for identifying relevant atomic-molecular clusters for ED analysis.
  • Application of the computational approach to semiclassical MD simulations of liquids.

Main Results:

  • Demonstrated successful application of ED to atomic clusters and supramolecular systems.
  • Enabled unbiased conformational analysis of local microstructures in liquids.
  • Validated the method's performance by accurately calculating characteristic observables of liquid water (NMR, NEXAFS O1s, IR spectra).

Conclusions:

  • The presented method effectively extends Essential Dynamics (ED) for conformational analysis of weakly interacting clusters.
  • This approach provides a robust tool for studying local microstructures in liquids, sensitive to hydrogen-bonded cluster conformations.
  • The successful reproduction of liquid water spectra highlights the method's potential for various chemical and physical systems.