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Francesco Silvio Gentile1, Simone Salustro, Mauro Causà

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The VN3H defect in diamond, a vacancy with three nitrogen and one hydrogen-saturated carbon atom, was studied. Its unique vibrational spectra, particularly the C-H stretch, allow for identification of this defect in diamonds.

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Area of Science:

  • Materials Science
  • Quantum Chemistry
  • Spectroscopy

Background:

  • Diamond defects significantly influence material properties.
  • The VN3H defect, a vacancy with three nitrogen atoms and a hydrogen-saturated carbon, is a complex defect in diamond.
  • Understanding its electronic and vibrational properties is crucial for defect identification.

Purpose of the Study:

  • To investigate the quantum-mechanical properties of the VN3H defect in diamond.
  • To characterize its structural and electronic configurations.
  • To analyze its vibrational spectroscopic features for identification purposes.

Main Methods:

  • Periodic supercell approach with an all-electron Gaussian-type basis set.
  • Density Functional Theory (DFT) using hybrid functionals (B3LYP).
  • Optimization of supercells (32, 64, 128 atoms) to assess defect concentration effects.

Main Results:

  • Detailed electronic configuration and structural features of the VN3H defect were determined.
  • The influence of nitrogen lone-pair electrons on the C-H bond was analyzed.
  • Vibrational spectra, including anharmonic effects, were computed, showing a C-H stretching mode at 3094 cm-1 (15 cm-1 redshift from experiment).
  • Isotopic substitution (14N -> 15N) confirmed the role of nitrogen atoms in spectral features.

Conclusions:

  • The VN3H defect exhibits distinct vibrational spectroscopic features, enabling its identification in natural and irradiated diamonds.
  • The computed C-H stretching mode provides a reliable spectral fingerprint.
  • The study highlights the importance of quantum-mechanical calculations in understanding and identifying complex defects in materials.