Anomalous Target<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>Z</mml:mi></mml:math>Dependence of Double to Single<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>K</mml:mi></mml:math>-Shell Vacancy Production in Cl-Beam X Rays

Woods, C. W.; Hopkins, Forrest; Kauffman, R. L.; Elliott, D. O.; Jamison, K. A.; Richard, Patrick

doi:10.1103/physrevlett.31.1

Cited by 24 publications

(5 citation statements)

References 10 publications

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“…Because a 1 is a very smooth function of target nuclear charge [11], also the a2/cr 1 ratio should not vary more than 10 ~ by changing the nuclear charge by two units, keeping the projectile velocity constant. Such a smooth dependence has also been found by Woods et al [2] [8J it has been found, that the 2s-shell in 32MeV S on Ar is highly ionized) the theoretical values are to be multiplied by about a factor two. Because the 2s-configuration in the systems investigated here is not accurately enough known, a more detailed comparison with theory is meaningless.…”

Section: Resultsmentioning

confidence: 55%

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Dependence of theK ? h /K ??-branching ratio on projectile velocity and nuclear charge

1979

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The branching ratio (BR) between hypersatellite-and two-electron-one-photon transition is investigated with S-and Cl-ion impact on C1-solid-and Ar-gaseous-target. A strong deviation from the scaling of the BR with the nuclear charge predicted for a constant shell configuration is obtained by comparing the BR of projectile-and target-atoms. This deviation can be explained by a different 2s-ionization of heavy and light collision partner.

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Section: Resultsmentioning

confidence: 55%

“…The production of double K-vacancy-states in ionatom collisions has been first established by the observation of hypersatellite lines (K~ h) [1,2]. Recently the existence of a two-electron-one-photon-(K~) transition into the empty K-shell has been reported [3][4][5] in several ion-atom collision systems.…”

Section: Introductionmentioning

confidence: 99%

Dependence of theK ? h /K ??-branching ratio on projectile velocity and nuclear charge

1979

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“…During the last few years several studies on the collision processes between ions and atoms in solid or gaseous targets based on measurements of the projectile K or L x-rays have been reported [1][2][3][4][5][6][7][8][9][10][11][12][13]. High-resolution x-ray studies have been carried out by Watson et al [6,7] using sulphur ions with an incident energy 64 MeV on a wide range of thick solid targets.…”

Section: Introductionmentioning

confidence: 99%

Configurations of highly ionized fast sulphur projectiles passing through a carbon foil evaluated from low-resolution K x-ray spectra

Majewska

Słabkowska

Polasik

et al. 2002

J. Phys. B: At. Mol. Opt. Phys.

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The Kα and Kβ satellite and hypersatellite x-ray lines for highly ionized sulphur projectiles passing through carbon foils of thickness between 15-210 µg cm-2 with energies of 99 and 122 MeV have been recorded using a Si(Li) detector. A new theoretical model based on the results of single-configuration Dirac-Fock calculations (and using equilibrium charge state distribution and fluorescence yields) has been proposed in order to evaluate the average population of different shells and to estimate the probability of appearance of the most important configurations in the sulphur ions passing through the carbon foils. The reliability of the model has been proved by a very good reproduction of the measured energy shifts for all Kα and Kβ satellite and hypersatellite peaks. The role of non-equilibrium charge fractions in various shells of sulphur ions has also been investigated in detail.

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“…In addition, the vacancies are also filled through a radiative electron capture (REC) process by the capture of quasi-free electrons from the target to inner-shell holes of the projectile atoms. Although the x-ray emission from the target atoms has been studied extensively, only a few systematic experimental studies have been reported on x-rays from projectiles in different solid targets (Mokler 1971, Woods et al 1973, Betz 1976, Watson et al 1978, Hay et al 1982, Awaya et al 1985, Zou et al 1995. Mokler (1971) has observed projectile x-ray spectra for iodine ions and has found a shift for the x-ray lines towards higher energy which has been explained as due to the loss of outer electrons and the creation of multi-vacancies in the inner shells.…”

Section: Introductionmentioning

confidence: 99%

Study of x-ray and L-REC photon emissions from highly ionized swift and projectiles passing through a thin carbon foil

Dhal

Padhi

Prasad

et al. 1998

J. Phys. B: At. Mol. Opt. Phys.

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X-rays and L-shell radiative electron capture (L-REC) photons have been detected from highly ionized swift projectiles of 75 As and 80 Se passing through a thin carbon foil at two incident projectile energies. All the K and L peaks show strong shifts towards higher energy as a result of multiple ionization of L-and M-shells. The Kβ/Kα intensity ratios have been found to be almost half of the value for the singly ionized atoms. The measured positions of various L and K x-ray peaks and the measured Kβ/Kα intensity ratios have been attributed to certain types of electronic configurations based on the extensive multiconfiguration Dirac-Fock calculations. Generally, it has been found that the lowest-energy configuration plays a rather small role, but in contrast the excited configurations with holes in the L-shell and with occupied 3d, 4s, 4p, 4d or higher subshells seem to be very important. The relative L-REC cross section between higher and lower projectile energies shows excellent agreement with the results obtained under the non-relativistic dipole approximation.

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Anomalous TargetZDependence of Double to SingleK-Shell Vacancy Production in Cl-Beam X Rays

Cited by 24 publications

References 10 publications

Dependence of theK ? h /K ??-branching ratio on projectile velocity and nuclear charge

Dependence of theK ? h /K ??-branching ratio on projectile velocity and nuclear charge

Configurations of highly ionized fast sulphur projectiles passing through a carbon foil evaluated from low-resolution K x-ray spectra

Study of x-ray and L-REC photon emissions from highly ionized swift and projectiles passing through a thin carbon foil

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