The Divergent-beam Diffractometer is the primary instrument at NIST used to certify powder SRMs for their X-ray diffraction properties. It is a custom-built instrument which provides a very highly-characterized angular scale in a well-controlled environment. It is a Bragg-Brentano instrument, usable with either open beam from a fine-focus copper X-ray tube, or using monochromated beam from a Ge(111) Johansson optic. The properties of this instrument are documented in a paper .
Created August 03, 2017, Updated November 20, 2017