<i>M</i>-shell ionization resulting from near-central collisions of mid-<i>Z</i>atoms with 5.5-MeV/amu oxygen ions

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

doi:10.1103/physreva.49.2524

Cited by 40 publications

(28 citation statements)

References 63 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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“…These revisited SCA calculations resulted in a much better agreement between the theoretical and experimental Land M-shell ionization probabilities [11].…”

Section: Introductionmentioning

confidence: 94%

“…This [42], and references therein, the approximation of the electron wave functions by hydrogeniclike ones is very crude and leads to results that reproduce poorly the experimental inner-shell ionization probabilities, except for the K shell. Several other authors [8,11,43] pointed out the importance of Hartree-Fock-type wave functions for the description of the ionization probabilities in near-central collisions, as well for the Las for the M-shell ionization probabilities. In our SCA-DHF calculations the Dirac-Hartree-Fock wave functions were calculated with the GRASP program for the bound atomic electrons.…”

Section: A Energiesmentioning

confidence: 99%

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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“…The results of these calculations enabled a reliable description of the influence of additional holes in the M shell on the shapes and positions of the K␤ 1,3 L 0 bands, which may be used in theoretical analysis of various experimental x-ray spectra generated in collisions with different ions. About ten years ago these results were applied together with previous ones to the theoretical analysis of the K␣ 1,2 L 0 M r and the K␤ 1,3 L 0 M r x-ray spectra of Mo [37], Pd, and La [38] induced by O ions, where a different method of the analysis of very complex K x-ray spectra accompanying the ionization of the target atoms in near-central collisions with energetic heavy ions was used. In this method the measured K␣ and K␤ spectra are simultaneously decomposed into the theoretical line profiles for the K␣ 1,2 L 0 M r and the K␤ 1,3 L 0 M r transitions, constructed on the basis of the results of the MCDF calculations.…”

Section: Introductionmentioning

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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M-shell ionization resulting from near-central collisions of mid-Zatoms with 5.5-MeV/amu oxygen ions

Cited by 40 publications

References 63 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

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

Structure of variousKL1x-ray satellite lines of heavy atoms

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