Depth-Sensitive Diamond Topography
The following proposal from our collaborators at CHESS was discussed at our meeting 1/17/2008.
Alexander Kazimirov ( ayk7@cornell.edu ) has been developing a method that can produce depth sensitive topographic information. The first publication is here. He thought it would be interesting to examine one of your thin diamonds as part of a study he will be doing at ESRF in a few weeks. Would you be interested in lending him a sample? Because the work involves method exploration and development, the sample could be broken or otherwise not too valuable for your needs, but it still should be a good crystal. The thickness could be anywhere from, say 10 to 50 or even 100 microns.
The following dialog ensued between us.
- What is the probability of breaking it?
There is no guarantee. Since this is a feasibility experiment, already broken samples are better. - What are the plans for mounting it?
Pre-mounted (on a frame, substrate) sample is preferred. - What minimum size is required?
I would say around 1 mm. Bigger samples (3 to 5 mm) are more convenient to work with. - Are there any other requirements? planarity? well-known rocking curves already measured? if so, which planes?
rocking curves measurements are helpful but not necessary, could be done later if there is any interesting results. Symmetrical reflection from the planes parallel to the surface will be used. Which planes will be used depends on the orientation.
Yang's proposal
Yang says that the present diamond inventory at Glasgow does not contain any small diamonds of good enough quality to be useful for this measurement, and the good ones are large enough that it would be a shame to risk breaking them. However, we know that the 20 micron diamond belonging to hall B at Jefferson Lab has good quality and also is already broken into small pieces. Why don't we ask our hall B colleagues if they would mind fishing a 1mm-size fragment out of the broken diamond jar and mount one or two of these fragments on a frame for studies in the X-ray beam at ESRF. We are actually interested in the depth profile of any defects in that thin diamond that might give a clue as to why it was so bent and warped.
Franz will contact the Hall B polarized beam group about possibly loaning one of the larger fragments from that diamond to our CHESS colleagues. 2/14/2008.
