Hi all
I'm reading a recent review by Elspeth Garman regarding radiation
damage (Acta Cryst D) and in this she mentions two ideas regarding
metal centers:
[1] They (The metal complexes themselves) are quickly reduced
[2] Their absorption causes localized heating in the crystal. (This
causes the temp to increase above freezing thus allowing OH radicals
to diffuse).
How is it that people can phase off of TaBr considering [1]?
Presumably as TaBr is absorbing x-ray's whatever anomalous signal that
was present at the beginning of the collection is either absent/
significantly altered by the time data collection is complete?
Regarding [2], is TaBr usually backsoaked (into cryoprotectant not
containing TaBr) to reduce it's concentration in the crystal to highly
occupied sites? It would seem to me that having a crystal soaked with
TaBr would cause more heating than one backsoaked.
Thanks
F
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Francis E. Reyes M.Sc.
215 UCB
University of Colorado at Boulder
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