1) you can calculate the approximate unit cell parameter(s) from the spots. I am guessing they will come out at 6-12 A (hard to tell from your image w/o actual distance, wavelength etc).
2) this seems to be a diffractogram of a crystal stack where about a dozen or two of thin plates are stuck together with a relatively good alignment in two dimensions and a variable alignment in the third
3) this seems to be a synchrotron image (based on the detector tiling) but the spots are not all Supernova-bright, which pretty much rules out ammonium sulfate crystals (and also the d-spacing is to large for simple salt).
So I'd guess you're shooting crystals of a small organic molecule, like a detergent would be (but could be something else too).
Artem
On Mon, May 30, 2011 at 4:21 AM, Bingfa Sun
<[log in to unmask]> wrote:
Dear All,
I have got crystals in a condition with about 1.7 M Ammonium Sulfate, and my buffer contains Hepes, NaCl and glycerol. Initial crystals are extremely thin, needlelike while adding of some detergent resulted in thicker, rodlike crystals. However, diffraction pattern is quite weird which do not seem to be a protein crystal or a typical salt crystal. Is this a detergent crystal or an ammonium sulfate crystal?
Diffraction images are in the attachment.
Thank you all in advance.
Bingfa
