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

Lifetimes of doubly K -shell ionized states

Polasik, M . ; Słabkowska, K. ; Kozioł, K. ; Starosta, J. ; Dousse, Jean-Claude ; Hoszowska, Joanna ; Rzadkiewicz, J.

In: Physica Scripta, 2011, vol. 2011, no. T144, p. 014021

The present work provides a reliable interpretation of the Khα₁/Khα₂ intensity ratios and an explanation of the lifetime values for K-shell hollow atoms based on an advanced theoretical analysis (using extensive multiconfiguration Dirac–Fock calculations with the inclusion of the transverse Breit interaction and quantum electrodynamics ...

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

Khα1,2 X-ray hypersatellite line broadening as a signature of K-shell double photoionization followed by outer-shell ionization and excitation

Polasik, M. ; Słabkowska, K. ; Rzadkiewicz, J. ; Kozioł, K. ; Starosta, J. ; Wiatrowska-Kozioł, E. ; Dousse, Jean-Claude ; Hoszowska, Joanna

In: Physical Review Letters, 2011, vol. 107, no. 7, p. 073001

We propose a novel approach for the theoretical analysis of the photoinduced high-resolution Khα1,2 x-ray hypersatellite spectra, which allows us to obtain reliable values of lifetimes of the doubly K-shell ionized states and fundamental information about the relative role of K-shell double photoionization (DPI) mechanisms. It is demonstrated for the first time that the...

Université de Fribourg

Observation of internal structure of the L-shell x-ray hypersatellites for palladium atoms multiply ionized by fast oxygen ions

Czarnota, M. ; Banaś, D. ; Berset, Michel ; Chmielewska, D. ; Dousse, Jean-Claude ; Hoszowska, Joanna ; Maillard, Yves-Patrick ; Mauron, Olivier ; Pajek, M. ; Polasik, M. ; Raboud, Pierre-Alexandre ; Rzadkiewicz, J. ; Słabkowska, K. ; Sujkowski, Z.

In: Physical Review A, 2010, vol. 91, no. 06, p. 064702

An observation of the internal structure of the L-shell hypersatellite x rays resulting from the one-photon decay of L⁻² double-vacancy states in palladium multiply ionized by oxygen ions is reported. The Pd L₃→M4,5 x-ray spectrum was measured with a von Hamos high-resolution crystal spectrometer. The complex shape of the observed spectrum could be interpreted in detail using...