Structure of single KL0–, double KL1–, and triple KL2 − ionization in Mg, Al, and Si targets induced by photons, and their absorption spectra

Ménesguen, Y.; Lépy, Marie‐Christine; Ito, Yoshiaki; Yamashita, Michiru; Fukushima, Sei; Tochio, T.; Polasik, M.; Słabkowska, K.; Syrocki, Ł.; Indelicato, P.; Gomilšek, Jana Padežnik; Marques, J. J. Figueiredo; Sampaio, J. M.; Machado, J.; Amaro, Pedro; Guerra, Mauro; Santos, J. P.; Parente, F.

doi:10.1016/j.radphyschem.2022.110048

Cited by 5 publications

(3 citation statements)

References 83 publications

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“…The Fe 2p spectra exhibit doublet spin‐orbit coupling peaks along with weak shake‐up satellites (The peak of photoelectron excited by the satellite ray of Al/Mg Kα 1,2 . [ 17 ] ), corresponding to Fe 2p 3/2 and Fe 2p 1/2 (Figure 2C), respectively. The Fe 2p spectrum of Fe‐NC‐NaCl indicates the presence of metal species in a positively charged state, with no zero‐valent iron species observed.…”

Section: Resultsmentioning

confidence: 99%

Refining Asymmetric Low‐Coordinated Fe‐N₃ Motif to Boost Catalytic Ozonation Activity

Qu,

Tang,

Tang

et al. 2024

Adv Funct Materials

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In the quest to boost the intrinsic activity of single‐atom catalysts (SACs), optimizing the electronic properties of metal centers and maximizing active sites play a pivotal role. Here, a facile surface molten salt‐assisted approach for fabricating porous iron‐nitrogen‐carbon catalysts enriched with catalytically accessible single‐atom motifs is reported. Multiple characterization analyses prove that abundant intrinsic defects are generated at the edge sites, resulting in the formation of thermally stable unstitched Fe‐N3 motif. Theoretical investigations unveil that the transition from Fe‐N4 to Fe‐N3 induces structural alteration, resulting in the convergence of Fe‐3d orbital energy to Fermi energy. The low‐coordinated Fe‐N3 motif exhibits higher activation ability, reinforcing its interaction with O3 and weakening the O‐O bond. This leads to a reduction in the reactivity of surface atomic oxygen barriers (O3‐to‐*O/*OO), ultimately achieving efficient catalytic oxidation of methyl mercaptan and its intermediates, achieving performance 20‐fold higher than intact Fe‐N4 catalysts and 625‐fold higher than commercial MnO2. These findings present a comprehensive approach for synthesizing SACs with fully accessible active sites and boosted electronic configurations to advance catalytic ozonation activity.

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Section: Resultsmentioning

confidence: 99%

Refining Asymmetric Low‐Coordinated Fe‐N₃ Motif to Boost Catalytic Ozonation Activity

Qu,

Tang,

Tang

et al. 2024

Adv Funct Materials

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“…The instrumental function is explained in detail in ref. 8–10, 12 and 13. An end-window type was adopted with a primary X-ray source of tungsten or rhodium, and the tube operated at 40 kV and 60 mA.…”

Section: Experimental Methodologymentioning

confidence: 99%

Natural linewidths of Cu Kα_1,2 spectra obtained with an antiparallel double-crystal X-ray spectrometer

Ito,

Tochio,

Yamashita

et al. 2024

J. Anal. At. Spectrom.

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“… ( a )

intensity ratio of the elements Mg to Cu. Cross marks are the present experimental data, open square are Scofield’s [ 3 ] theoretical data, solid diamonds [ 6 ], open diamonds in Mg, Al, and Si [ 23 ]. The

spectral lines in each of the elements were measured using a high-resolution double-crystal X-ray spectrometer [ 6 , 20 , 24 ].…”

Section: Figurementioning

confidence: 99%

Intensity Ratio of Kβ/Kα in Selected Elements from Mg to Cu, and the Chemical Effects of Cr Kα1,2 Diagram Lines and Cr Kβ/Kα Intensity Ratio in Cr Compounds

Ito

Tochio²,

Yamashita

et al. 2023

IJMS

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Kα,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 Kβ/Kα 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 3d elements region, the increase becomes slower. This is related to the intensity of the Kβ line involving valence electrons. The slow increase of this ratio in the 3d elements region is thought to be due to the correlation between 3d and 4s electrons. Moreover, the chemical shifts, FWHM, asymmetry indices, and Kβ/Kα 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 Kβ/Kα intensity ratio was found to be compound-dependent for Cr.

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Structure of single KL0–, double KL1–, and triple KL2 − ionization in Mg, Al, and Si targets induced by photons, and their absorption spectra

Cited by 5 publications

References 83 publications

Refining Asymmetric Low‐Coordinated Fe‐N₃ Motif to Boost Catalytic Ozonation Activity

Refining Asymmetric Low‐Coordinated Fe‐N₃ Motif to Boost Catalytic Ozonation Activity

Natural linewidths of Cu Kα_1,2 spectra obtained with an antiparallel double-crystal X-ray spectrometer

Intensity Ratio of Kβ/Kα in Selected Elements from Mg to Cu, and the Chemical Effects of Cr Kα1,2 Diagram Lines and Cr Kβ/Kα Intensity Ratio in Cr Compounds

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Structure of single KL0–, double KL1–, and triple KL2 − ionization in Mg, Al, and Si targets induced by photons, and their absorption spectra

Cited by 5 publications

References 83 publications

Refining Asymmetric Low‐Coordinated Fe‐N3 Motif to Boost Catalytic Ozonation Activity

Refining Asymmetric Low‐Coordinated Fe‐N3 Motif to Boost Catalytic Ozonation Activity

Natural linewidths of Cu Kα1,2 spectra obtained with an antiparallel double-crystal X-ray spectrometer

Intensity Ratio of Kβ/Kα in Selected Elements from Mg to Cu, and the Chemical Effects of Cr Kα1,2 Diagram Lines and Cr Kβ/Kα Intensity Ratio in Cr Compounds

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Product

Resources

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Refining Asymmetric Low‐Coordinated Fe‐N₃ Motif to Boost Catalytic Ozonation Activity

Refining Asymmetric Low‐Coordinated Fe‐N₃ Motif to Boost Catalytic Ozonation Activity

Natural linewidths of Cu Kα_1,2 spectra obtained with an antiparallel double-crystal X-ray spectrometer