Université de Fribourg

Diagram, valence-to-core, and hypersatellite Kβ X-ray transitions in metallic chromium

Zeeshan, Faisal ; Hoszowska, Joanna ; Dousse, Jean-Claude ; Sokaras, Dimosthenis ; Weng, Tsu-Chien ; Alonso-Mori, Roberto ; Kavčič, Matjaz ; Guerra, Mauro ; Sampaio, Jorge Miguel ; Parente, Fernando ; Indelicato, Paul ; Marques, José Pires ; Santos, José Paulo

In: X-Ray Spectrometry, 2019, vol. 48, no. 5, p. 351–359

We report on measurements of the Kβ diagram, valence‐to‐core (VtC), and hypersatellite X‐ray spectra induced in metallic Cr by photon single and double K‐shell ionization. The experiment was carried out at the Stanford Synchrotron Radiation Lightsource using the seven‐crystal Johann‐type hard X‐ray spectrometer of the beamline 6‐2. For the Kβ diagram and VtC transitions, the...

Université de Fribourg

Hypersatellite x-ray decay of $3d$ hollow-$K$-shell atoms produced by heavy-ion impact

Maillard, Yves-Patrick ; Dousse, Jean-Claude ; Hoszowska, Joanna ; Berset, Michel ; Mauron, Olivier ; Raboud, Pierre-Alexandre ; Kavčič, Matjaz ; Rzadkiewicz, J. ; Banaś, Dariusz ; Tökési, K.

In: Physical Review A, 2018, vol. 98, no. 1, p. 012705

We report on the radiative decay of double K-shell vacancy states produced in solid Ca, V, Fe, and Cu targets by impact with about 10 MeV/amu C and Ne ions. The resulting K hypersatellite x-ray emission spectra were measured by means of high- energy-resolution spectroscopy using a von Hamos bent crystal spectrometer. The experiment was carried out at the Philips variable energy cyclotron of...

Université de Fribourg

Double K-shell photoionization and hypersatellite x-ray transitions of 12⩽Z⩽23 atoms

Hoszowska, Joanna ; Dousse, Jean-Claude ; Cao, Wei ; Fennane, Karima ; Kayser, Yves ; Szlachetko, Monika ; Szlachetko, Jakub ; Kavčič, Matjaz

In: Physical Review A, 2010, vol. 82, no. 6, p. 063408

Single-photon double K-shell ionization of low-Z neutral atoms in the range 12⩽Z⩽23 is investigated. The experimental method was based on measurements of the high- resolution Kαh hypersatellite x-ray spectra following the radiative decay of the K-shell double-vacancy states excited by monochromatic synchrotron radiation. The photon energy dependence of the double K-shell ionization was...

Université de Fribourg

High energy resolution measurements of the radiative decay of double K-shell vacancies in 20 ≤ Z ≤ 29 elements bombarded by fast C and Ne ions

Dousse, Jean-Claude ; Maillard, Yves-Patrick ; Berset, Michel ; Castella, D. ; Hoszowska, Joanna ; Kavčič, Matjaz ; Kobal, M. ; Mauron, Olivier ; Muehleisen, A. ; Raboud, Pierre-Alexandre ; Rzadkiewicz, J. ; Tökési, K. ; Zorko, B.

In: Journal of Physics: Conference Series, 2015, vol. 635, no. 2, p. 022054

We report on high energy resolution measurements of the Kα hypersatellite x-ray spectra of Ca, V, Fe and Cu induced by impact with 144 MeV C and 180 MeV Ne ions.

Université de Fribourg

High-resolution x-ray-emission study of 1s4p and 1s3d two-electron photoexcitations in Kr

Kavčič, Matjaz ; Žitnik, M. ; Sokaras, D. ; Weng, T.-C. ; Alonso-Mori, R. ; Nordlund, D. ; Dousse, Jean-Claude ; Hoszowska, Joanna

In: Physical Review A, 2014, vol. 90, no. 2, p. 022513

High-energy-resolution photoexcited KN2,3 x-ray-emission measurements were carried out on krypton with the excitation energy tuned around the 1s4p and 1s3d double-excitation thresholds. Comprehensive two-dimensional resonant inelastic x-ray-scattering maps were recorded for the range of excitation and emission energies corresponding to both types of double excitations. The double-excitation...

Université de Fribourg

Dissociation of chloromethanes upon resonant σ* excitation studied by x-ray scattering

Bohinc, R. ; Žitnik, M. ; Bučar, K. ; Kavčič, Matjaz ; Journel, L. ; Guillemin, R. ; Marchenko, T. ; Simon, M. ; Cao, Wei

In: The Journal of Chemical Physics, 2014, vol. 139, no. 13, p. 134302

The dissociation process following the Cl K-shell excitation to σ* resonances is studied by high resolution spectroscopy of resonant elastic and inelastic x-ray scattering on CH3Cl, CH2Cl2, CHCl3, and CCl4 molecules. Calculations employing the transition potential and Delta-Kohn-Sham DFT approach are in good agreement with the measured total fluorescence yield and show the presence of...

Université de Fribourg

Depth profiling of dopants implanted in Si using the synchrotron radiation based high-resolution grazing emission technique

Kayser, Yves ; Banaś, D. ; Cao, Wei ; Dousse, Jean-Claude ; Hoszowska, Joanna ; Jagodziński, P. ; Kavčič, Matjaz ; Kubala-Kukuś, A. ; Nowak, S. ; Pajek, M. ; Szlachetko, Jakub

In: X-Ray Spectrometry, 2012, vol. 41, no. 2, p. 98-104

We report on the surface-sensitive grazing emission X-ray fluorescence technique combined with synchrotron radiation excitation and high-resolution detection to realize depth-profile measurements of Al-implanted Si wafers. The principles of grazing emission measurements as well as the benefits offered by synchrotron sources and wavelength-dispersive detection setups are presented. It is shown...

Université de Fribourg

First observation of two-electron one-photon transitions in single-photon K-Shell double ionization

Hoszowska, Joanna ; Dousse, Jean-Claude ; Szlachetko, Jakub ; Kayser, Yves ; Cao, Wei ; Jagodziński, P. ; Kavčič, Matjaz ; Nowak, S. H.

In: Physical Review Letters, 2011, vol. 107, no. 5, p. 053001

xperimental evidence for the correlated two-electron one-photon transitions (1s⁻²→2s⁻¹2p⁻¹) following single-photon K-shell double ionization is reported. The double K-shell vacancy states in solid Mg, Al, and Si were produced by means of monochromatized synchrotron radiation, and the two-electron one-photon radiative transitions were observed by using a wavelength dispersive...

Université de Fribourg

Resonant inelastic x-ray scattering at the limit of subfemtosecond natural lifetime

Marchenko, T. ; Journel, L. ; Marin, T. ; Guillemin, R. ; Carniato, S. ; Žitnik, M. ; Kavčič, Matjaz ; Bučar, K. ; Mihelič, A. ; Hoszowska, Joanna ; Cao, Wei ; Simon, M.

In: The Journal of Chemical Physics, 2011, vol. 134, no. 14, p. 144308

We present measurements of the resonant inelastic x-ray scattering (RIXS) spectra of the CH3I molecule in the hard-x-ray region near the iodine L2 and L3 absorption edges. We show that dispersive RIXS spectral features that were recognized as a fingerprint of dissociative molecular states can be interpreted in terms of ultrashort natural lifetime of ∼200 attoseconds in the case of the iodine...

Université de Fribourg

High-resolution KMM radiative Auger x-ray emission spectra of calcium induced by synchrotron radiation

Cao, Wei ; Kavčič, Matjaz ; Dousse, Jean-Claude ; Berset, Michel ; Bučar, K. ; Budnar, M. ; Fennane, Karima ; Hoszowska, Joanna ; Maillard, Yves-Patrick ; Szlachetko, Jakub ; Szlachetko, Monika ; Žitnik, M.

In: Physical Review A, 2011, vol. 83, no. 4, p. 042513

The KMM radiative Auger (RA) x-ray spectra of solid Ca were induced by monochromatic synchrotron radiation and measured with a high-resolution von Hamos bent crystal spectrometer. Two excitation energies were employed, one in the near K threshold region and the second well above the K absorption edge. The KMM RA spectral structure and relative intensity with respect to the diagram ...