Probabilities for<i>L</i>-shell ionization in intermediate-velocity collisions of medium-mass elements with<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi mathvariant="normal">He</mml:mi></mml:mrow><mml:mrow /><mml:mrow><mml:mn>2</mml:mn><mml:mo>+</mml:mo></mml:mrow><mml:mrow /><mml:mrow /><mml:mprescripts /><mml:mrow /><mml:mrow><mml:mn>4</mml:mn></mml:mrow><mml:mrow /><mml:mrow /></mml:mmultiscripts></mml:mrow></mml:math>ions

Boschung, B.; Carlen, M.; Dousse, J.-Cl.; Galley, B.; Herren, Ch.; Hoszowska, J.; Kern, J.; Rhéme, Ch.; Ludziejewski, T.; Rymuza, P.; Sujkowski, Z.; Halabuka, Z.

doi:10.1103/physreva.52.3889

Cited by 18 publications

(6 citation statements)

References 44 publications

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“…This value is in good agreement with the SCA-DHF (0.075) and GM (0.056) predictions, whereas the SCA-DH model, which predicts a value of 0.023, underestimates the M -shell ionization probability to a larger extent than the L-shell probability. Note that similar observations were done in former multiple ionization studies of mid-heavy elements bombarded by light and heavy ions [8][9][10].…”

Section: Resultssupporting

confidence: 55%

High-resolution X-ray study of the multiple ionization of Pd atoms by fast oxygen ions

et al. 2010

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Abstract. The multiple ionization of the L-and M -shells of Pd by fast oxygen ions has been studied by measuring with high-resolution the satellite structures of the Lα1,2 X-ray transitions. Relativistic multiconfiguration Dirac-Fock (MCDF) calculations were used to interpret the complex X-ray spectrum, allowing to derive the number of L-and M -shell spectator vacancies at the moment of the X-ray emission. After correcting these numbers for the atomic vacancy rearrangement processes that take place prior to the X-ray emission, the ionization probabilities corresponding to the collision time were obtained. The latter were compared to predictions of the semiclassical approximation (SCA) and the geometrical model. The SCA calculations were performed using relativistic hydrogenic and self-consistent Dirac-Hartree-Fock (DHF) electronic wave functions. It was found that the use of the more realistic DHF wave functions in the SCA calculations leads to a much better description of the measured ionization probabilities for both the Land M -shells.

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Section: Resultssupporting

confidence: 55%

High-resolution X-ray study of the multiple ionization of Pd atoms by fast oxygen ions

et al. 2010

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“…It has also been used in the study on the K␤ 2 L n M r lines of Zr, Mo, and Pd induced by proton and photon beams [39], the K␤ 2 L n M r lines of Zr, Nb, Mo, and Pd generated by electrons [40] and by C ions [43], and also the K␣ 1,2 L n M r , K␤ 1,3 L n M r [53], and K␤ 2 L n M r [41] lines of Zr, Mo, Pd, and Pr generated by He ions. Recently, the MCDF-MSAL method has been applied to the calculations of many different K x-ray diagram lines and their KL 1 M 0 satellite lines for Ta, Pb, and Th.…”

Section: Mcdf Calculationsmentioning

confidence: 99%

Structure of variousKL1x-ray satellite lines of heavy atoms

Polasik

Lewandowska-Robak

2004

Phys. Rev. A

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Multiconfiguration Dirac-Fock calculations with the inclusion of the transverse (Breit) interaction and QED corrections have been carried out for Pd, Sn, Tb, Ta, Pb, and Th in order to obtain positions and intensities of various electric dipole, electric quadrupole, and magnetic dipole K x-ray diagram lines and of their KL 1 satellites. Theoretically constructed stick spectra have been presented together with synthesized spectra (the sum of the Lorentzian natural line shapes) for each studied element. Taking into account the existence of an L-shell hole in the 2s or 2p subshell, the effect of additional L-shell ionization on the shapes and structure of the K x-ray spectra has been examined. It has been observed that generally with increasing atomic number Z the shapes of particular satellite line groups tend to become smoother and to differ less from the shapes of appropriate diagram lines. Relations between the values of energy shifts of various satellite lines for each element and the changes of these relations with Z have also been studied. Additionally, the relations between the intensities of different diagram lines for each element have been systematically analyzed, likewise the changes with Z of the role of particular diagram lines. This study can be helpful in reliable and quantitative interpretation of many experimental K x-ray spectra of Pd, Sn, Tb, Ta, Pb, and Th induced in collisions with various projectiles.

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“…The corresponding cross-section ratios (σ KK /σ K ) SCA HWF are quoted in the fourth columns of Tables X and XI. In a more recent version of the SCA code, the radial hydrogenic wave functions were replaced by more realistic Dirac-Hartree-Fock wave functions (DHF) for both bound and continuum states [60]. As this change resulted into a much better agreement between experiment and theory for the ionization probabilities of the L shell [61] and especially the M shell [62], SCA DHF calculations were also carried out for this study. As shown in Tables X and XI, the double-to-single ionization cross-section ratios (σ KK /σ K ) SCA DHF are bigger than the ones obtained with the SCA HWF calculations and closer to the experimental ratios.…”

Section: Double-to-single Ionization Cross-section Ratiosmentioning

confidence: 99%

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

et al. 2018

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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.

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Probabilities forL-shell ionization in intermediate-velocity collisions of medium-mass elements withHe2+4ions

Cited by 18 publications

References 44 publications

High-resolution X-ray study of the multiple ionization of Pd atoms by fast oxygen ions

High-resolution X-ray study of the multiple ionization of Pd atoms by fast oxygen ions

Structure of variousKL1x-ray satellite lines of heavy atoms

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

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