The creation of the 3107 cm1 hydrogen absorption

1
The creation of the 3107 cm-1 hydrogen absorption
peak in synthetic diamond single crystals
Sim Gyu Man
2
Introduction

• 3107 cm-1 absorption peak in synthetic diamonds
  grown by the high pressure-
• high temperature (HPHT) method was first
  observed.

• The 3107 cm-1 IR absorption peak is attributed
  to a C-H stretch vibration.

Experimental
Annealed at 2650?, 9GPa
60 ? x 60 ? of samples
IR spectra observed using Nicolet Magna-IR 750
FTIR spectrometer
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Results Discussion
3107 cm-1
Comparison of the IR spectra in range of
3130-3180 cm-1 before (dotted line) and after
annealing at 2650? for 5h (solid line), sowing
the introduction of the 3107 cm-1 peak
The correlation of the intensity of the 3107 cm-1
line and the total nitrogen concentration at
various location of specimen V17 (correlation
coefficient Equals 0.96)
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Conclusion

• The 3107 cm-1 peak was not observed in locations
  where the nitrogen
• concentration was low (less than about 100ppm)

• A very small 3107 cm-1 peak, having an
  absorption coefficient of 0.02 cm-1,
• was found in a natural type IIa diamond

• Correlation is found between the total nitrogen
  content and the strength of the
• peak in a particular sample