M. Kavčič

Fluoride detoxification in tea plants depends on aluminium and localization in the epidermis

Chenyu Zhang, Paula Pongrac, Katarina VogelMikuš, M. Kavčič et autres

Tea (Camellia sinensis) is a hyperaccumulator of both aluminium (Al) and fluorine (F). While the formation of Al-F complexes has been proposed as a key mechanism for F detoxification and accumulation in tea, excessive Al and especially fluoride (F−) pose health risks …

Fluoride detoxification in tea plants depends on aluminum and localization in the epidermis

Chenyu Zhang, Paula Pongrac, Vogel-Mikus Katarina, Alessandra Gianoncelli et autres

Tea (Camellia sinensis) is a hyperaccumulator of both aluminum (Al) and fluorine (F). While the formation of Al-F complexes has been proposed as a key mechanism for F detoxification and accumulation in tea, excessive Al and especially fluoride (F-) pose health risks …

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Toward Practical Aluminum Organic Batteries Featuring Covalent Organic Framework

Olivera Lužanin, Raquel Dantas, Ava Rajh, Urban Košir et autres

In recent years, Al metal organic batteries have attracted significant interest due to their promise of sustainability and high volumetric energy densities, while being based on abundant materials. However, many studies assess their performance with insufficient rigor, often emphasizing high capacity and …

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In-Air Micro-PIXE Mapping with Chemical Contrast

M. Kavčič, Ava Rajh

Currently, chemically specific X-ray fluorescence imaging is restricted to synchrotron facilities and based on the chemical selectivity of X-ray absorption spectra. In this article, we demonstrate the capability of high-energy-resolution micro-PIXE spectroscopy to perform two-dimensional (2D) chemical state mapping of sulfur and …

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Sulfur Speciation in Li–S Batteries Determined by Operando Laboratory X-ray Emission Spectroscopy

Ava Rajh, Alen Vižintin, Joanna Hoszowska, Robert Dominko et autres

High Resolution Image Download MS PowerPoint Slide In this work, operando sulfur X-ray emission measurements on a Li–S battery cathode were performed using a laboratory setup as an alternative to more common synchrotron radiation based absorption studies. Photoexcitation by an X-ray tube …

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Structural and chemical analysis of hard carbon negative electrode for Na-ion battery with X-ray Raman scattering and solid-state NMR spectroscopy

Ava Rajh, Matej Gabrijelčič, Blaž Tratnik, K. Bučar et autres

This study explores the structural changes of hard carbon (HC) negative electrodes in sodium-ion batteries induced by insertion of Na ions during sodiation. X-ray Raman spectroscopy (XRS) was used to record both C and Na K-edge absorption spectra from bulk HC anodes …

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In-air micro-PIXE chemical state analysis of phosphorus and sulfur using a new parallel-beam wavelength-dispersive X-ray emission spectrometer

M. Kavčič

The proton induced K X-ray emission spectra of several different phosphorus and sulfur compounds were recorded with the new parallel-beam wavelength dispersive X-ray emission spectrometer. The spectrometer was installed recently at the external proton microbeam at the J. Stefan Institute to perform …

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In-Air Micro-Pixe Chemical State Analysis Using a New Parallel-Beam Wavelength-Dispersive X-Ray Emission Spectrometer

M. Kavčič

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Structural and Chemical Analysis of Hard Carbon Negative Electrode for Na-Ion Battery with X-Ray Raman Scattering and Solid-State Nmr Spectroscopy

Ava Rajh, Matej Gabrijelčič, Blaž Tratnik, K. Bučar et autres

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Shake-up and shake-off processes

M. Kavčič, M. Žitnik

Because of correlations, more than one atomic electron can change its orbital in a single photon absorption. Due to these multi-electron photoexcitations (MPEs), the atomic photoabsorption cross sections exhibit characteristic tiny spectral structures above the corresponding absorption edges. Since the atomic cross …

Auger decay of 1s−13p−1nln′l′ doubly excited states in Ar

M. Žitnik, Mateja Hrast, A. Mihelič, K. Bučar et autres

The natural widths of atomic resonances do not broaden spectral lines of emitted particles, which makes the corresponding spectroscopies suitable for high-resolution studies of x-ray absorption. While resonant inelastic x-ray scattering (RIXS) results in a narrow-band x-ray signal which primarily depends on …

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Auger Shake-Up Assisted Electron Recapture

M. Žitnik, Mateja Hrast, A. Mihelič, K. Bučar et autres

The presence of doubly excited states (DESs) above the core-hole ionization threshold nontrivially modulates the x-ray absorption because the participator Auger decay couples DESs to the underlying low-energy core-hole continuum. We show that coupling also affects the high-energy continuum populated by the …

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