I agree - looks like small molecular diffraction.
Try increasing delta-phi to catch more of the lattice to confirm - I
often do a 5º image or two with the detector pushed as close as
possible to check for salt diffraction when screening.
The lack of low res (~15-20Å) spots around the beamstop is another
"smoking gun".
HTH
Dave
============================
David C. Briggs PhD
Father, Structural Biologist and Sceptic
============================
University of Manchester E-mail:
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http://manchester.academia.edu/DavidBriggs (v.sensible)
http://xtaldave.wordpress.com/ (sensible)
http://xtaldave.posterous.com/ (less sensible)
Twitter: @xtaldave
Skype: DocDCB
============================
On 7 December 2010 14:14, xiuwen zhang <[log in to unmask]> wrote:
> Dear Colleagues,
>
> Currently we got several very tiny crystals. After exposuring a cluster
> of crystals one hour in home source, we could find some weak diffraction
> spots. As the spots are too few for indexing, I am not quite sure whether
> these tiny crystals are salt crystals or protein crystals. I appreciate your
> experience on similar case.
>
> Attached files are two diffraction images at 0 and 90 degree. Thank you
> very much for your kind help.
>
> Cheers,
> Xiuwen
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