What question did this study set out to answer?

To introduce a computationally efficient local equation-of-motion technique for calculating mean-square half-path-length fluctuations in multiple-scattering X-ray-absorption fine-structure Debye-Waller factors for aperiodic systems.

January 1, 1999Physical review. B, Condensed matter

Multiple-scattering x-ray-absorption fine-structure Debye-Waller factor calculations

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Authors

APA. V. PoiarkovaUniversity of Washington JRJ. J. RehrUniversity of Washington

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Implication

Computational study demonstrates an efficient equation-of-motion method for Debye-Waller factors in aperiodic systems, highlighting linear computational scaling with system size.

Key Points

To introduce a computationally efficient local equation-of-motion technique for calculating mean-square half-path-length fluctuations in multiple-scattering X-ray-absorption fine-structure Debye-Waller factors for aperiodic systems.
Formulated a local equation-of-motion approach requiring only a few local force constants as inputs.
Computed mean-square fluctuations using projected densities of vibrational modes or real-time displacement-displacement correlation functions evaluated over several vibrational cycles without symmetry constraints.
Tested the methodology on model crystalline and molecular structures, including crystalline copper, germanium, and zinc tetraimidazole.
Achieved computational scaling that increases strictly linearly with atomic system size.
Successfully bypassed the need for crystalline symmetry or periodic boundary conditions when evaluating multiple-scattering path fluctuations.
Demonstrated accurate application to both crystalline (Cu, Ge) and molecular (zinc tetraimidazole) systems.

Cite This Study

Poiarkova et al. (1999) studied this question.

synapsesocial.com/papers/6a194b22f2eb401dc788e135 https://doi.org/10.1103/physrevb.59.948

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Implication

Computational study demonstrates an efficient equation-of-motion method for Debye-Waller factors in aperiodic systems, highlighting linear computational scaling with system size.

Multiple-scattering x-ray-absorption fine-structure Debye-Waller factor calculations

Discussion

Member takes

Implication

Key Points

Cite This Study

Multiple-scattering x-ray-absorption fine-structure Debye-Waller factor calculations

Discussion

Member takes

Implication

Key Points

Cite This Study

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