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

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

Research output: Contribution to journalArticle

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

Fingerprint

Isotopes
isotope effect
vibration mode
silicon isotopes
Crystals
Morse potential
Deuterium
hydrogen
infrared absorption
crystals
deuterons
deuterium
Hydrogen
isotopes
harmonics
protons
Infrared absorption
Silicon
Stretching
Protons

Keywords

  • Anharmonicity
  • FTIR
  • Hydrogen
  • Silicon

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

Cite this

Local vibrational modes of bond-centered H in 28Si, 29Si, and 30Si crystals. / Pereira, R. N.; Ohya, T.; Itoh, Kohei M; Bech Nielsen, B.

In: Physica B: Condensed Matter, Vol. 340-342, 31.12.2003, p. 697-700.

Research output: Contribution to journalArticle

Pereira, R. N. ; Ohya, T. ; Itoh, Kohei M ; Bech Nielsen, B. / Local vibrational modes of bond-centered H in 28Si, 29Si, and 30Si crystals. In: Physica B: Condensed Matter. 2003 ; Vol. 340-342. pp. 697-700.
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