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

Abstract

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 the Paul Scherrer Institute. From the fits of the x-ray spectra the energies, line widths, and relative intensities of the hypersatellite x-ray lines could be determined. The fitted intensities were corrected to account for the energy-dependent solid angle of the spectrometer, effective source size, target self-absorption, crystal reflectivity, and detector efficiency. The single-to-double K-shell ionization cross-section ratios were deduced from the corrected relative intensities of the hypersatellites and compared to theoretical predictions from the semiclassical approximation model using hydrogenlike and Dirac-Hartree-Fock wave functions and from classical trajectory Monte Carlo calculations.

Experimental determination of the gadolinium L subshells fluorescence yields and Coster‐Kronig transition probabilities

“…In this respect, a substantial part of the research activities of Prof. Jean-Claude Dousse was directed to an accurate determination of different atomic FPs using reflection-type or transmission-type high energyresolution crystal-based spectrometers 27,60 and standalone laboratory-based X-ray sources, synchrotron radiation, or charged particles for the excitation of the X-ray emission processes to be studied. Examples of this work include the study of linewidths of X-ray emission processes, 28 radiative Auger transitions, 24 Xray resonant Raman scattering, 59 CK factors, 9,10 hypersatellite X-ray transitions, 26,42 two-electron one-photon transitions, 29 atomic level widths, 21 and off-resonant X-ray spectroscopy. 7 In this work, an independent investigation of the CK factors of the Gd L shell using two different detection schemes, a radiometrically calibrated silicon drift detector (SDD) and a full cylinder von Hamos spectrometer, is reported as a further illustration of the valuable contributions of wavelengthdispersive spectrometry to an accurate determination of atomic FPs.…”

Multielectron ionization contributions in valence‐to‐core x‐ray emission spectra of third‐row elements

“…Within a long lasting and fruitful Ljubljana-Fribourg collaboration we have successfully applied these satellite/hypersatellite measurements to study inner shell ionization induced in ion-atom collisions. [1][2][3][4] Important experimental developments and rich spectroscopic experience gained throughout these studies could be directly used later on when we moved to synchrotron radiation and used satellite measurements to study photoinduced multiple excitation and ionization. [5][6][7][8][9] Compared with ion-induced inner shell ionization governed by direct Coulomb's charged particle interaction, photoinduced multielectron excitations are direct consequence of the electron-electron correlations yielding very low cross sections.…”

A highly oriented pyrolytic graphite crystal spectrometer in von Hamos geometry for x-ray fluorescence experiments

“…In some applied fields, for example particle-induced x-ray emission (PIXE) [8], it also requires the information provided by the characterization of x-ray emission. X-ray crystal spectrometers have been proven to be an excellent instrument for measuring high-resolution xray spectra [9][10][11][12][13][14]. Usually, in order to overcome the relatively low efficiency of crystal spectrometers, non-perfect or curved crystals are used.…”