|PSI - Group
The thin diamond in program
Beam Modification of diamond
Thin diamond single crystals
Staff : SH Connell, CM Levitte, M Rebak, E Sideras-Haddad,
IZ Machi, DB Rebuli.
: A. Naran, L Mkhonza
: P Aggerholm (Aarhus), J.E. Butler (NRL-Washington)
We have a thin single crystal diamond program.
Various methods are used.
of these processes are is studied, as well as being applied to the development
with MeV C ions, anneal, etch out the buried damaged layer. We can
from 1 - 10 um foils, On channeling, they have minimum yields of about
so there is some residual damage.
ablation. This method allows a "frame" to remain, for support of the
5mm diameter is easily achieved, and about 30 um thickness is possible.
chemisorption. Mn or Stainless steel pellets are placed in contact
with the diamond
under slight pressure and high at temperature. This method achieves an
excellent surface finish,
and can also leave a frame for support. We get similar thicknesses as
the previous method.
polishing - Important intial preparation. Recod is a 5um diamond. Suffers
deformation at the edges. Polishing also leaves subsurface damage
of the methods can be used.
1st method can be deployed in its complimentary mode to remove material.
A rather good surface finish is also achieved in this case.
for the next generation of Ion Beam Analysis studies on diamond.
These special thin single crystals
are also supplied to collaborators and colleagues overseas for joint experiments.
Example of First technique and an Experiment
is implanted to a dose that cause the damage to exceed threshold
for non-recovery in the Bragg peak area. Then its annealed to recover
overlayer and drive the buried damage layer to amorphous carbon.
This electrically conductive layer is then etched electrolytically,
allowing the damaged layer to be removed.
The following is an experiment of the ttype "transmission channeling
elastic scattering" to detect bonded oxygen alignment with atomic rows
on the rear surface
The kinematic location of the forward scattered oxygen is shown by the
rocking curve for forward scattering of oxygen confirms the model of oxygen