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> > > But for some crystals flash-cooling is better at temperatures higher > than in the 77 K to 100 K regime for unknown reasons. This can be one > reason why flash-cooling in the gas stream occassionally is better. > It is also why liquid propane worked for Raji E. and Karolin L.: they > were using a temperature above the freezing point of propane. > Hi Jim, could the reason for this be cold annealing ? You have an imperfect crystal lattice which thanks to the slow cooling can adjust it's lattice slightly to yield better diffracting crystals ? In my simple mind this is how I imagine flash annealing procedures. Juergen -- Jürgen Bosch University of Washington Dept. of Biochemistry, K-426 1705 NE Pacific Street Seattle, WA 98195 Box 357742 Phone: +1-206-616-4510 FAX: +1-206-685-7002 Web: http://faculty.washington.edu/jbosch