Local vibrational modes of bond-centered H in 28Si, 29Si, and 30Si crystals

R. N. Pereira, T. Ohya, K. M. Itoh, B. Bech Nielsen

Research output: Contribution to journalConference article

8 Citations (Scopus)

Abstract

The local vibrational mode of positively charged bond-centered hydrogen (HBC+) has been investigated in Si crystals enriched with 28Si,29Si, or 30Si isotopes. Protons and deuterons were implanted into each sample at temperatures below 20 K, and in-situ-type infrared absorption measurements were subsequently performed at 8 K. The isotope shifts observed for the hydrogen and deuterium modes display opposite behavior with increasing mass of the silicon isotope. This behavior cannot be accounted for with a purely harmonic potential. We apply a simple model based on the linear molecule Si-H-Si, where the potential associated with the stretching of each Si-H bond is approximated by the Morse potential. The local mode frequencies and the isotope shifts obtained with our model are in excellent agreement with those observed.

Original languageEnglish
Pages (from-to)697-700
Number of pages4
JournalPhysica B: Condensed Matter
Volume340-342
DOIs
Publication statusPublished - 2003 Dec 31
EventProceedings of the 22nd International Conference on Defects in (ICDS-22) - Aarhus, Denmark
Duration: 2003 Jul 282003 Aug 1

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Keywords

  • Anharmonicity
  • FTIR
  • Hydrogen
  • Silicon

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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