Article: NCNR PUTS INTO OPERATION NEW PERFECT CRYSTAL DIFFRACTOMETER FOR ULTRA-HIGH RESOLUTION SANS.(Brief Article)

A perfect crystal diffractometer (PCD) for ultra-high resolution small-angle neutron scattering (USANS) measurements is now operational at NIST's Center for Neutron Research (NCNR). The PCD increases the maximum size of features accessible with the NCNR's 30 m long, pinhole collimation SANS instruments by nearly two orders of magnitude, from [approximate][10.sup.2] nm to [10.sup.4] nm.

The PCD is a Bonse-Hart-type instrument with large triple-bounce, channel-cut silicon (220) crystals as monochromator and analyzer. The perfect crystals provide high angular resolution while the multiple reflections suppress the "wings" of the beam profile, improving the ...

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