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Several recent improvements have
made it possible to collect better data,
faster at the F2 station: |
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Flux down the collimator has been
improved, particularly at low energies, by installation of a
longer in-vacuum focusing mirror, removal of some absorbers in
the beam upstream of the hutch, and replacement of the beam pipe
in the hutch with a helium-filled, better shielded, model. A
group that recently collected data at the Zn edge (9.6 KeV)
reported a 20-30% improvement in X-ray intensity over an earlier
visit. Another group was able to get sufficient anomalous signal
at 7.1 KeV to successfully perform sulfur SAD phasing. At the
optimum energy of about 13 KeV, high quality monochromatic data
may be collected, albeit with
exposure times longer than those for A1 or F1.
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Energy drifts have been reduced,
due to increased beam stability in the present filling mode and
to better thermal control for monochromator box components. New
software makes it easier to perform energy calibrations when
needed.
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Data collection facilities are on
a par with the A1 and F1 stations: the goniostat incorporates an
air bearing to allow rapid, precise spindle rotation, the X-ray
detector is an ADSC Q-210 CCD with 1-second readout time, a
convenient and reliable crystal centering system is in
place, and new Opteron computers with a 2 TB RAID system
attached are used for data collection and processing. A variety
of phasing and structure solution programs are available.
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May 2006
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Conducting the
experiment |
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