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Dr. Mauro Guerra

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Department of Physics, Faculty of Sciences and Technology, New University of Lisbon, Lisbon, Portugal
Interests: X-ray spectroscopy; high-resolution X-ray fluorescence imaging; elemental quantification of biological samples; plasma physics; highly charged ions; atomic structure
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Dr. Jorge Machado

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Dr. Marta Manso

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Department of Physics, Faculty of Sciences and Technology, New University of Lisbon, Lisbon, Portugal
Interests: X-ray spectroscopy; X-ray fluorescence imaging; Raman spectroscopy; elemental and structural characterization of cultural heritage materials

Special Issue Information

Dear Colleagues,

Although the field of X-ray spectrometry has been around almost since the discovery of X-rays by Wilhelm Conrad Röntgen, there are still numerous unexplored areas of physics and applications accessible by X-ray spectrometry. The development of new technology and techniques for elemental quantification through X-ray spectrometry makes it one of the preferable options for, among others, material characterization, quantification of biological and geological samples, and cultural heritage applications, mostly due to the non-destructive aspect of the technique and portability of the spectrometers. Moreover, many studies beyond the current state of knowledge are based in X-ray spectrometry of exotic states of matter. The development of high-precision instruments and apparatus allows the comparison with the currently accepted knowledge, testing it and challenging it in order to improve our understanding of nature.

This Special Issue will serve as a gateway to connect several fields of science that have in common X-ray processes and technologies, aiming at both theoretical and experimental aspects of X-ray science.

Dr. Mauro Guerra
Dr. Jorge Machado
Dr. Marta Manso
Guest Editors

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Keywords

X-ray spectrometry
X-ray absorption and emission
material characterization
X-ray imaging
elemental quantification

Published Papers (1 paper)

Research

15 pages, 1358 KiB

Open AccessArticle

Intensity Ratio of Kβ/Kα in Selected Elements from Mg to Cu, and the Chemical Effects of Cr Kα_1,2 Diagram Lines and Cr Kβ/Kα Intensity Ratio in Cr Compounds

by Yoshiaki Ito, Tatsunori Tochio, Michiru Yamashita, Sei Fukushima, Takashi Shoji, Katarzyna Słabkowska, Łukasz Syrocki, Marek Polasik, Jana Padežnik Gomilsek, José Pires Marques, Jorge Miguel Sampaio, Mauro Guerra, Jorge Machado, José Paulo Santos, Assala Hamidani, Abdelhalim Kahoul, Paul Indelicato and Fernando Parente

Int. J. Mol. Sci. 2023, 24(6), 5570; https://doi.org/10.3390/ijms24065570 - 14 Mar 2023

Cited by 1 | Viewed by 1822

Abstract

K α, β

X-ray lines from photon excitation were measured in selected elements from Mg to Cu using a high-resolution double-crystal X-ray spectrometer with a proportional counter, and the

K β / K α

intensity ratio for each element was obtained, after [...] Read more.

K α, β

X-ray lines from photon excitation were measured in selected elements from Mg to Cu using a high-resolution double-crystal X-ray spectrometer with a proportional counter, and the

K β / K α

intensity ratio for each element was obtained, after correcting for self-absorption, detection efficiency, and crystal reflectance. This intensity ratio increases rapidly from Mg to Ca but, in the

3 d

elements region, the increase becomes slower. This is related to the intensity of the

K β

line involving valence electrons. The slow increase of this ratio in the

3 d

elements region is thought to be due to the correlation between

3 d

and

4 s

electrons. Moreover, the chemical shifts, FWHM, asymmetry indices, and

K β / K α

intensity ratios of the Cr compounds, due to different valences, were also investigated using the same double-crystal X-ray spectrometer. The chemical effects were clearly observed, and the

K β / K α

intensity ratio was found to be compound-dependent for Cr. Full article

(This article belongs to the Special Issue X-ray Spectrometry)

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