Structure of the Fe and Ni L X-ray spectra

Sepúlveda, A.; Rodríguez, T.; Pérez, Pablo Daniel; Bertol, Ana Paula Lamberti; Carreras, Alejo C.; Trincavelli, J.; Vasconcellos, M.A.Z.; Hinrichs, Ruth; Castellano, G.

doi:10.1039/c6ja00398b

Cited by 8 publications

(8 citation statements)

References 19 publications

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“…A pure bulk Sn standard was irradiated by a 16-keV electron beam in a JEOL JXA 8230 electron probe in which a Johansson-type wavelength dispersive spectrometer (WDS) is attached, the take-off angle being 40 • . The x-ray L spectrum emitted was acquired by means of a PET analyzing crystal with an already characterized efficiency curve ε(E ), in terms of the detected photon energy E [26], and registered with a P10 flow counter. This curve was originally determined [27] from the comparison of two experimental spectra acquired from one single sample at the same incidence energy, one of them recorded with an energy dispersive spectrometer (EDS), and the second one with the WDS whose efficiency was surveyed.…”

Section: Methodsmentioning

confidence: 99%

Experimental determination of Sn L -shell atomic parameters

Fernandez,

Sepúlveda,

Limandri

et al. 2023

Phys. Rev. A

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A careful inspection on the tin L x-ray spectrum induced by electron impact was carried out, with the aim of obtaining fundamental atomic properties related to core ionizations and subsequent emissions. A bulk tin standard was irradiated, the resulting spectrum being recorded with a commercial wavelength dispersive spectrometer, and processed by means of a parameter optimization method previously developed. Characteristic energies, relative transition probabilities and natural linewidths were therefore experimentally determined for this element, and compared with data from the literature, when available. Satellite and radiative Auger effect structures were also investigated, for which the corresponding energy shifts and relative intensities were obtained. A number of these parameters were determined, even in overlapping peaks and weak transitions, which evidences the robustness of the spectral processing method used.

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Section: Methodsmentioning

confidence: 99%

Experimental determination of Sn L -shell atomic parameters

Fernandez,

Sepúlveda,

Limandri

et al. 2023

Phys. Rev. A

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“…Atomic-level widths for atomic levels K to N 7 were compiled by Campbell & Papp (2001) from available experimental data but, unfortunately, they do not include data for the M 4,5 levels of Ni, Cu, Fe, and Zn, which are needed to calculate the La line widths. Experimental natural La line widths for metallic Fe, Ni, Cu, and Zn have been reported by Bonnelle (1966), Faessler (2013, Rémond et al (2002), andSepúlveda et al (2017), which are listed in Table 2. In this work, we have arbitrarily adopted the natural FWHMs reported by Bonnelle for Fe (3.7 eV) and Ni (2.58 eV) and by Faesler for Cu (3.7 eV), and Zn (1.7 eV).…”

Section: Self-absorption Of Diagram Linesmentioning

confidence: 99%

“…The latter is formed either by an L 1 -L 3 M Coster-Kronig transition or by a shake-off process, in which an electron from the M-shell is ejected at the same time that the 2p 3/2 vacancy is formed. A satellite line is also visible at the low energy side of the La line, originated by the radiative Auger effect (RAE) (Sepúlveda et al, 2017). The effect of satellite lines can be included in equation ( 4) by letting L(E) be the sum of both diagram and satellite contributions, i.e.…”

Section: Effect Of Satellites and Instrumental Broadeningmentioning

confidence: 99%

“…Höfer & Brey (2007) developed the so-called flank method, which essentially consists of measuring the Lb/La intensity ratio at energy positions suitably selected on a self-absorption spectrum, to obtain the Fe oxidation state in selected minerals. The effect of self-absorption has also been considered with a view to improving the spectral fitting of wavelength-dispersive spectra (Rémond et al, 1993(Rémond et al, , 1996(Rémond et al, , 2002Sepúlveda et al, 2017). However, the influence of self-absorption on quantitative analysis has been rarely addressed.…”

Section: Introductionmentioning

confidence: 99%

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Electron Probe Microanalysis of Transition Metals using L lines: The Effect of Self-absorption

2021

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Electron microprobe-based quantitative compositional measurement of first-row transition metals using their L $\alpha$ X-ray lines is hampered by, among other effects, self-absorption. This effect, which occurs when a broad X-ray line is located close to a broad absorption edge, is not accounted for by matrix corrections. To assess the error due to neglecting self-absorption, we calculate the L $\alpha$ X-ray intensity emitted from metallic Fe, Ni, Cu, and Zn targets, assuming a Lorentzian profile for the X-ray line and taking into account the energy dependence of the mass absorption coefficient near the absorption edge. We find that calculated X-ray intensities depart increasingly, for increasing electron beam energy, from those obtained assuming a narrow X-ray line and a single fixed absorption coefficient (conventional approach), with a maximum deviation of $\sim$ 15% for Ni and of $\sim$ 10% for Fe. In contrast, X-ray intensities calculated for metallic Zn and Cu do not differ significantly from those obtained using the conventional approach. The implications of these results for the analysis of transition-metal compounds by electron probe microanalysis as well as strategies to account for self-absorption effects are discussed.

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“…Regarding spectator hole satellite lines, the distortion of levels caused by the presence of an additional vacancy is more important for the outer shells than for the inner ones. For this reason, for a given diagram transition, the satellite lines associated are more intense for lower atomic numbers [2][3][4][5][6]. Analogously, for a given element, the satellite emission is expected to be more noticeable for lines involving more external shells.…”

Section: Introductionmentioning

confidence: 98%

X-ray emission in atomic transitions to M shells of Hf, Ta, W, Pt and Au

Trincavelli

Andrada

Carreras

2019

J. Phys. B: At. Mol. Opt. Phys.

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The x-ray emission in atomic decays to M-shell of Hf, Ta, W, Pt and Au induced by electrons was studied. To this purpose, M x-ray spectra were acquired with a wavelength dispersive spectrometer, and processed by a parameter refinement method previously developed. A large set of atomic parameters corresponding to diagram transitions, such as characteristic energies, relative transition probabilities, and natural linewidths was determined. In addition, energy shifts and relative intensities of satellite emissions associated with M5N6,7 and M4N6 diagram lines, were assessed. The results obtained are compared with data from the literature, when available.

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Structure of the Fe and Ni L X-ray spectra

Abstract: Diagram and satellite line parameters were obtained from Fe-L and Ni-L X-ray spectra induced by electron impact.

Cited by 8 publications

References 19 publications

Experimental determination of Sn L -shell atomic parameters

Experimental determination of Sn L -shell atomic parameters

Electron Probe Microanalysis of Transition Metals using L lines: The Effect of Self-absorption

X-ray emission in atomic transitions to M shells of Hf, Ta, W, Pt and Au

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