A compact dispersive refocusing Rowland circle X-ray emission spectrometer for laboratory, synchrotron, and XFEL applications

Abstract

Articles you may be interested inCCD camera as feasible large-area-size x-ray detector for x-ray fluorescence spectroscopy and imaging Review of Scientific Instruments 88, 063703 (2017) (Received 25 April 2017; accepted 6 July 2017; published online 27 July 2017) X-ray emission spectroscopy is emerging as an important complement to x-ray absorption fine structure spectroscopy, providing a characterization of the occupied electronic density of states local to the species of interest. Here, we present details of the design and performance of a compact x-ray emission spectrometer that uses a dispersive refocusing Rowland (DRR) circle geometry to achieve excellent performance for the 2-2.5 keV range, i.e., especially for the K-edge emission from sulfur and phosphorous. The DRR approach allows high energy resolution even for unfocused x-ray sources. This property enables high count rates in laboratory studies, approaching those of insertion-device beamlines at third-generation synchrotrons, despite use of only a low-powered, conventional x-ray tube. The spectrometer, whose overall scale is set by use of a 10-cm diameter Rowland circle and a new small-pixel complementary metal-oxide-semiconductor x-ray camera, is easily portable to synchrotron or x-ray free electron laser beamlines. Photometrics from measurements at the Advanced Light Source show excellent overall instrumental efficiency. In addition, the compact size of this instrument lends itself to future multiplexing to gain large factors in net collection efficiency or its implementationincontrolledgasgloveboxeseitherinthelaborinanendstation.

Probing Surface Defects of InP Quantum Dots Using Phosphorus Kα and Kβ X-ray Emission Spectroscopy

“…Recent progress in benchtop XES instrumentation holds the potential to develop XES of sulfur and phosphorus into an accessible and powerful technique for probing oxidation state and bonding electronic structure, achieving synchrotron-level energy resolution and count rates with a spectrometer illuminated by only a conventional X-ray tube. 21 The same instrument was used in a recent study of sulfur speciation in biochars as a first analytical application, 22 and the present study reinforces and, in many ways, exceeds the message of that earlier work in emphasizing new potential for XES for routine application in analytical chemistry.…”

TEXS: in-vacuum tender X-ray emission spectrometer with 11 Johansson crystal analyzers

“…In this case, a spectrum can be recorded in a stationary configuration. We note that there are hybrid instruments that work in point-to-point focusing with dispersion correction [21][22][23] . An important application for the instrument presented here is HERFD-XANES in samples with low analyte concentration.…”

4‐1: Invited Paper: Role of Phosphorus Oxidation in Controlling the Luminescent Properties of Indium Phosphide Quantum Dots

“…Recent progress in benchtop XES spectrometry at the University of Washington holds the potential to develop XES of sulfur and phosphorus into an accessible and powerful technique for probing oxidation state and bonding electronic structure for those elements, achieving synchrotron-level energy resolution and count rates with a spectrometer illuminated by only a conventional x-ray tube. 15 The use of XES as an analytical tool to probe electronic structure has previously been limited in the field of nanoscience. 16,17…”