High-resolution Laue-type DuMond curved crystal spectrometer

Abstract

We report on a high-resolution transmission-type curved crystal spectrometer based on the modified DuMond slit geometry. The spectrometer was developed at the University of Fribourg for the study of photoinduced X-ray spectra. K and L X-ray transitions with energies above about 10 keV can be measured with an instrumental resolution comparable to their natural linewidths. Construction details and operational characteristics of the spectrometer are presented. The variation of the energy resolution as a function of the focal distance and diffraction order is discussed. The high sensitivity of the spectrometer is demonstrated via the 2s-1s dipole-forbidden X-ray transition of Gd which could be observed despite its extremely low intensity. The precision of the instrument is illustrated by comparing the sum of the energies of the Au K-L 2 and L 2 -M 3 cascading transitions with the energy of the crossover K-M 3 transition as well as by considering the energy differences of the Gd Kα 1 X-ray line measured at five different diffraction orders. Finally, to demonstrate the versatility of the spectrometer, it is shown that the latter can also be used for in-house extended X-ray absorption fine structure measurements.

A laboratory-based hard x-ray monochromator for high-resolution x-ray emission spectroscopy and x-ray absorption near edge structure measurements

“…This has been especially true after the development and commercial availability of CCD-based x-ray detectors allowed the highly productive implementation of von Hamos style, wavelength dispersive spectrometers. [65][66][67][68][69][70] Laboratory-based work using SBCA's is less common, but includes comparative studies of x-ray emission from direct x-ray excitation as opposed to from Kcapture. 83,88 …”

“…By contrast, and with only rare exceptions in the last 20 years, 'routine' hard x-ray XAFS [49][50][51][52][53][54][55][56][57][58][59][60][61][62][63][64] and high-resolution XES [65][66][67][68][69][70] can only be performed at the synchrotron light sources.…”

Benchmark results and theoretical treatments for valence-to-core x-ray emission spectroscopy in transition metal compounds

“…This has led to continuing effort by several groups to develop laboratory-based XES capabilities. [59][60][61][62][63] Here, using this equipment at the University of Washington, [64][65][66] we present a high-quality VTC dataset of several inorganic Zn and Fe compounds. These compounds provide an interesting range of local electronic and atomic structure while retaining sufficient structural simplicity such that theoretical treatment should not, a priori, be challenged by material complexity.…”

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

“…However, the significant restriction of this method to synchrotron light sources has inhibited its broader implementation especially for industrial and more analytical, rather than fundamental, directions. Recent work in several groups [23][24][25][26][27][28] has aimed to resolve this issue by developing laboratory-based XES instruments ranging from as low as the C K-edge (284 eV) 27 to as high as the Au K-edge (78 keV). 28 Of particular interest here are highresolution laboratory measurements of sulfur and phosphorous x-ray emission using double-crystal spectrometers, [29][30][31] von Hamos geometry instruments, 32,33 and a dispersive Rowland circle geometry.…”