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First-Principles Estimation of Core Level Shifts for Hf, Ta, W, and Re.

Daniel Wolverson1, Benjamin Smith1, Enrico Da Como1

  • 1Centre for Nanoscience and Nanotechnology and Department of Physics, University of Bath, Bath BA2 7AY, United Kingdom.

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This study introduces a simple method to calculate core level shifts for Hf, Ta, W, and Re metals using X-ray photoelectron spectroscopy (XPS). The approach accurately models surface shifts and provides insights into charge density waves and MXene surfaces.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Surface Science

Background:

  • Core level shifts in X-ray photoelectron spectroscopy (XPS) are crucial for understanding electronic structure.
  • Investigating Hf, Ta, W, and Re 4f electrons is important due to their proximity to the Fermi energy.

Purpose of the Study:

  • To develop and validate a simple first-principles approach for estimating core level shifts.
  • To apply this method to elemental metals, TaSe2, and hypothetical MXenes.

Main Methods:

  • Utilizing a first-principles computational approach.
  • Modeling surface core level shifts for elemental metals (Hf, Ta, W, Re).
  • Applying the method to TaSe2 in its commensurate charge density wave (CDW) phase and hypothetical Ta3C2 MXene.

Main Results:

  • The method accurately models surface core level shifts for elemental metals.
  • Good agreement with experimental data for TaSe2, indicating insights into CDW modifications.
  • Demonstrated potential of XPS for investigating MXene surface termination.

Conclusions:

  • The developed first-principles approach is effective for estimating core level shifts.
  • This method offers valuable insights into surface phenomena in metals, CDWs, and MXenes.
  • XPS is a powerful tool for characterizing MXene surface terminations.