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Vibrational dynamics and surface structure of amorphous selenium.

T Scopigno1, W Steurer, S N Yannopoulos

  • 1Dipartimento di Fisica, Universitá di Roma 'La Sapienza', Roma I-00185, Italy.

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|February 18, 2011
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Summary
This summary is machine-generated.

Researchers explored the surface structure and vibrational dynamics of amorphous selenium. A high concentration of coordination defects on the surface explains differences compared to the bulk amorphous material.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Surface Science

Background:

  • Amorphous materials lack long-range order, leading to unique properties.
  • Surface structure and dynamics of amorphous solids remain largely unexplored.
  • Understanding surface effects is crucial for nanomaterials.

Purpose of the Study:

  • To investigate the differences in atomic structure and vibrational dynamics between bulk and surface amorphous selenium.
  • To identify the structural origins of these surface-bulk discrepancies.

Main Methods:

  • Grazing incidence inelastic X-ray scattering (GIXS) for experimental analysis.
  • Ab initio and semiempirical molecular orbital calculations for theoretical modeling.
  • Scrutiny of various structural models to explain experimental observations.

Main Results:

  • Distinct differences in vibrational dynamics and atomic structure were observed between bulk and surface (top 5 nm) amorphous selenium.
  • A high concentration of specific coordination defects was identified as the cause of these surface anomalies.
  • The findings provide a detailed understanding of amorphous surface structure.

Conclusions:

  • Coordination defects significantly influence the surface properties of amorphous materials.
  • Resolving amorphous surface structures is vital for applications involving nanoparticles.
  • This study provides a foundation for further research into amorphous surface phenomena.