New developments in micro-X-ray diffraction and X-ray absorption spectroscopy for high-pressure research at 16-BM-D at the Advanced Photon Source

Changyong Park; Dmitry Popov; Daijo Ikuta; Chuanlong Lin; Curtis Kenney-Benson; Eric Rod; Arunkumar Bommannavar; Guoyin Shen

doi:10.1063/1.4926893

New developments in micro-X-ray diffraction and X-ray absorption spectroscopy for high-pressure research at 16-BM-D at the Advanced Photon Source

Rev Sci Instrum. 2015 Jul;86(7):072205. doi: 10.1063/1.4926893.

Authors

Changyong Park¹, Dmitry Popov¹, Daijo Ikuta¹, Chuanlong Lin¹, Curtis Kenney-Benson¹, Eric Rod¹, Arunkumar Bommannavar¹, Guoyin Shen¹

Affiliation

¹ High Pressure Collaborative Access Team, Geophysical Laboratory, Carnegie Institution of Washington, Argonne, Illinois 60439, USA.

PMID: 26233345
DOI: 10.1063/1.4926893

Abstract

The monochromator and focusing mirrors of the 16-BM-D beamline, which is dedicated to high-pressure research with micro-X-ray diffraction (micro-XRD) and X-ray absorption near edge structure (XANES) (6-45 keV) spectroscopy, have been recently upgraded. Monochromatic X-rays are selected by a Si (111) double-crystal monochromator operated in an artificial channel-cut mode and focused to 5 μm × 5 μm (FWHM) by table-top Kirkpatrick-Baez type mirrors located near the sample stage. The typical X-ray flux is ∼5 × 10(8) photons/s at 30 keV. The instrumental resolution, Δq/qmax, reaches to 2 × 10(-3) and is tunable through adjustments of the detector distance and X-ray energy. The setup is stable and reproducible, which allows versatile application to various types of experiments including resistive heating and cryogenic cooling as well as ambient temperature compression. Transmission XANES is readily combined with micro-XRD utilizing the fixed-exit feature of the monochromator, which allows combined XRD-XANES measurements at a given sample condition.