PSI - Group
Hydrogen Chemistry and Dynamics by MSR spectroscopy in diamond

taff : IZ Machi (UNISA), SH Connell (WITS), K Bharuth-Ram (University of Kwazulu-Natal)
Students : D Gxawu (Durban Inst of Technology), J Sithole (UNISA)
Collaborators : JM Baker (Oxford), JE Butler (NRL-Washington), SFJ Cox (Rutherford Lab), T. Jestadt (Oxford). R Kiefl (TRIUMF), J Major (MPI-Stuttgart), P. Murphy (Oxford), R Scheuermann (MPI-Stuttgart), A Seeger (MPI-Stuttgart)

Our friend the muon  ......    

Muonium-defect interactions as well as muonium dynamics are being explored using Muon Spin Rotation/Relaxation/Resonance (MSR) spectroscopy. The current program takes advantage of the unique properties of the muon to probe the behaviour of the hydrogen-like atom in diamond.

Why study Muonium in diamond ?   See here

Highlights :
  1. Quantum Diffusion of Muonium - See Abstract for Diamond-2004
  2. Passivation of acceptors by muonium,
  3. A new nitrogen trap for muonium,
  4. Photochromism in MSR.
  5. The first observation of diamagnetic muon relaxation.
  6. Contribution of MSR to electronic diamond - See Abstract for HFI-2004 invited talk

Current program ....
The search for n-type shallow dopants related to hydrofen complexation in diamond !

The RAl-2004 experiment pics and

The basics of MSR (c. TRIUMF)
  • Muon production
  • Implantation into sample
  • Detection of decay positron
The decay positron emission direction is correlated with the muon spin direction.

We have a probe whose polarisation we can track. So the magnetic and electronic environment can be studied using the magnetic and hyperfine interactions.