Fast and Ultrafast Energy-Dispersive X-Ray Reflectrometry Based on Prism Optics

Band‐reject‐filtering X‐ray spectra by mosaic structures of pyrolytic graphite

“…The full width at half minimum of the spectral valleys can vary from tens of electronvolt to several kiloelectron volt depending on the HOPG mosaic spread, HOPG filters arrangement, and rejected energy region. We should also note that HOPG has a high thermal conductivity, which allows the use of such filters in high‐power synchrotron radiation experiments when the suppression of a given harmonic in the broad undulator spectrum is necessary …”

“…We should also note that HOPG has a high thermal conductivity, [17,21] which allows the use of such filters in high-power synchrotron radiation experiments when the suppression of a given harmonic in the broad undulator spectrum is necessary. [11] Easy scanning of the rejected spectral band can be useful to avoid some measurement errors. For example, artifact peaks in florescence spectra due to diffraction in crystal structure of samples may be easily identified by rejecting the appropriate spectral band in the primary spectrum.…”

“…The band-reject filter may be also of interest when working with synchrotron sources in cases where a polychromatic spectrum containing several harmonics of the undulator is used to obtain a certain ratio of the intensity of harmonics or to suppress one of them. [11] This paper shows that the effective solution of the above-mentioned problems can be achieved by means of specially arranged film structures of highly oriented pyrolytic graphite (HOPG). The structural characteristics of HOPG and its applications for monochromatization and radiation focusing were discussed in detail in Freund et al; Zastrau et al; and Grigorieva, et al [12][13][14] This article focuses on investigation and analysis of the filtration properties of this material due to X-ray diffraction extinction.…”

“…Such tasks, in particular, are (a) reducing the level of the characteristic lines of the radiation source during the energy dispersive fluorescent analysis; (b) suppressing one of the lines of the K‐series of the primary spectrum in X‐ray diffractometry of polycrystals; (c) creating a spectral valley in the excitation spectrum to increase the sensitivity of detection of weak fluorescent lines; and (d) smoothing the primary spectrum in static energy dispersive diffractometry and reflectometry. The band‐reject filter may be also of interest when working with synchrotron sources in cases where a polychromatic spectrum containing several harmonics of the undulator is used to obtain a certain ratio of the intensity of harmonics or to suppress one of them …”

Recent developments in the application of X-ray and neutron reflectivity to soft-matter systems

“…Finally, a novel approach similar to that employed on the "RAINBOWS" reflectometer at the ILL (see next section) is presented by Tur'yanskii and co-workers [25]. The authors are using a diamond prism to decompose the spectrum of a polychromatic X-ray beam, which again largely removes the need for angular scanning.…”