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

doi:10.1103/physreva.51.3650

Cited by 28 publications

(16 citation statements)

References 46 publications

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“…The details of the spectrometer and the experimental setup were described in Refs. [14,15]. The (110) reflecting planes of a 2.5-mm-thick natural quartz crystal were used for the diffraction of the x rays.…”

Section: Methodsmentioning

confidence: 99%

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

et al. 1995

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The Kn and KP x ray spectra of zirconium, molybdenum, palladium, and praseodymium bombarded by 28-, 40-, 65-, and 100-MeV He + ions were measured with a high-resolution transmission curved crystal spectrometer. The KaL' and K/3L' satellite lines were observed and resolved from the parent diagram lines. The deduced satellite energy shifts are very well reproduced by multiconfiguration Dirac-Fock calculations. The experimental average L-shell ionization probabilities for nearly central collisions were obtained from the measured relative yields of the satellites. They are compared with theoretical predictions from the semiclassical independent particle approximation using hydrogenic wavefunctions (SCA-HWF) or Dirac-Hartree-Fock wave functions (SCA-DHF) and with n-body classical trajectory Monte Carlo (CTMC) calculations. A satisfactory agreement is obtained between the experimental probabilities and the SCA-DHF predictions. The variation of the probabilities in function of the projectile reduced velocity is also well reproduced by CTMC calculations although the predictions are in general smaller than the values deduced from our experiment. The same holds for the SCA-HWF calculations for which, in addition, an increasing discrepancy with the projectile reduced velocity is observed.PACS number(s): 34.50. Fa, 32.30.Rj, 32.70.Jz

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Section: Methodsmentioning

confidence: 99%

“…From the relation (15), which will be discussed in the next section, one deduces that 4 ]~1 L x n, l = -+-7~~+~L ,~,X …”

Section: Corrections For Electron Rearrangementmentioning

confidence: 99%

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

et al. 1995

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“…The Lorentzian represents the natural line shape of the X-ray transition, while the Gaussian profile accounts for the instrumental response of the spectrometer and the additional broadening due to the multiple ionization in the outer shells [8,9]. The observed spectral lines were analysed by means of a least-squares-fitting program employing Voigt functions.…”

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confidence: 99%

Natural widths of hypersatellite K-X-ray lines and lifetimes of double K-hole states in mid-Z atoms

Rzadkiewicz

Chmielewska

Sujkowski

et al. 2005

Nuclear Instruments and Methods in Physics Research Section B:

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K-X-ray spectra of Zr, Nb, Mo and Pd targets bombarded with 250 MeV carbon and 360 MeV oxygen ions are studied with high resolution diffraction spectrometry. Relative yields and natural widths of the K h a 1,2 hypersatellite lines are determined and compared with those of the diagram lines. The widths of K h a 1,2 lines are compared with the new phenomenological formula which takes into account the retardation of the K h a 1 transition in the LS coupling scheme. The data significantly exceed the expected values. Deduced lifetimes of the double K-hole states are shorter than expected.

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“…In experiments with protons, however, where additional outer shell ionization is less probable, double-ionization cross sections for some low-Z elements could be obtained [4]. The same is true for heavy ions on mid-Z atoms [5], where additional outer-shell ionization was also negligible. In both cases the dominant ionization mechanism was direct Coulomb ionization, since the collisions were quite asymmetric ͑Z projectile Ӷ Z target ͒.…”

Section: Introductionmentioning

confidence: 89%

Double-K-shell ionization of Mg and Si induced in collisions with C and Ne ions

et al. 2004

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The satellite and hypersatellite K x-ray emission of a thin Mg foil and thick polycrystalline Si target bombarded by 34-MeV C and 50-MeV Ne ions was measured using high-resolution crystal diffractometry. The corresponding projectile reduced velocities v / v K were 1.09 and 0.92 for C ions and 1.02, 0.86 for Ne ions in case of Mg and Si targets, respectively. An energy resolution of approximately 0.5 eV enabled separation of contributions corresponding to states with different numbers of K-and L-shell vacancies. The relative intensities of satellite and hypersatellite lines were determined by fitting the measured spectra with line shapes calculated using the GRASP92 computer code. To determine the production yields of initial states from the measured x-ray yields, the total decay schemes of initial states were considered. The decay schemes were also used to determine the relative intensities of components contributing to the observed K␣ satellites and hypersatellites and K␤ satellite intensities. Including theoretical predictions in the fitted model is crucial to analyze properly the K␣ hypersatellite region which overlaps the K␤ satellites. The initial-state production yields were then used to determine the L-shell ionization probabilities and the double-to single-K-shell ionization ratio corresponding to the four investigated collisions. The experimental values were compared to the theoretical predictions obtained within the independent electron model using single-electron ionization probabilities calculated by the three-body classical trajectory Monte Carlo (CTMC) method. Since the targets used were thick enough, the equilibrium projectile charge-state distributions in the solid media were assumed. While for the double-to single-K-shell ionization ratios a satisfactory agreement was observed between the CTMC predictions and our experimental results, the L-shell ionization probabilities were found to be overestimated by the CTMC calculations by a factor of about 2.

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Kα hypersatellite lines of medium-mass atoms induced by 100-MeVHe2+4ions

Cited by 28 publications

References 46 publications

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

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

Natural widths of hypersatellite K-X-ray lines and lifetimes of double K-hole states in mid-Z atoms

Double-K-shell ionization of Mg and Si induced in collisions with C and Ne ions

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