Systematic study of impact parameter dependent K-vacancy probabilities in near symmetric gas- and solid-target collision systems

Schuch, R.; Hoffmann, R.; Müller, K.; Pflanz, E.; Schmidt‐Böcking, H.; Specht, H. J.

doi:10.1007/bf01415654

Cited by 18 publications

(11 citation statements)

References 32 publications

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“…Attempts have been undertaken to interpret the measurements in terms of two-collision probabilities by folding Monte Carlo trajectory calculations for the projectile scattering with 2pvr-2po. vacancy sharing probabilities but they did not improve the agreement with experimental results, therefore leaving a lack of an explanation [7]. In this paper we show that these ionsolid-target measurements can be explained in the framework of a many-electron time dependent Dirac-Fock-Slater approach.…”

Section: Introductionmentioning

confidence: 56%

“…For some lighter ionsolid. -target collision system the 2@~-2@0.coupling scheme seems to give a qualitative explanation in the large impact parameter range but it fails to reproduce experimental P(b) curves in the low impact parameter range [7]. Generally the maximum calculated with the scaling law of Briggs, Taulbjerg, and Vaaben [13] is shifted towards larger impact parameters.…”

Section: Introductionmentioning

confidence: 85%

“…The later calculations were done by first evaluating a mean Lvacancy production probability and then utilizing the formalism of Anholt [19] to fold the L-vacancy production and the 2@m'-2po rotational coupling probability for all combinations of scattering angles of two-collision events, which give the same detection angle 0 relative to the beam axis [7]. Both of these calculated probabilities differ [7] are shown as black diamonds.…”

Section: Introductionmentioning

confidence: 99%

“…Both of these calculated probabilities differ [7] are shown as black diamonds. The partial contributions of the 3(1/2)6, 4(1/2)+, and l(3/2)+ vacancies are shown as difFerently shaded arrays.…”

Section: Introductionmentioning

confidence: 99%

“…Detailed experimental results on the sum of projectile and target K-vacancy probabilities as a function of impact parameter 6 are given in the paper by Schuch et al [7]. The experimental results, which are presented in Fig.…”

Section: Introductionmentioning

confidence: 99%

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Relativisticab initiointerpretation ofL-Kvacancy sharing in ion–solid-target collisions

et al. 1995

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The first experiments measuring the impact-parameter-dependent I-K vacancy sharing in ionsolid-target collisions started almost two decades ago. A rather qualitative explanation of the vacancy sharing process was achieved in the framework of the 2pvr-2pa coupling scheme developed by Briggs and Taulbjerg, but for most of the collision systems significant discrepancies remained. Even a multiple collision calculation using the 2pm-2pcr coupling scheme, as undertaken by Schuch et al. , did not improve the agreement with the experimental results and left a lack of an explanation. , calling for first-principles calculations. Using our ab initio relativistic Dirac-Fock-Slater many-electron basis set method, we confirm that both a qualitative and quantitative explanation can be given for the I-K vacancy sharing process in heavy ionsolid-target collisions. As an example, we compare our results with measurements for 108-Mev Br on ¹solid targets. PACS number(s): 34.50.s, 31.15.Ar

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Section: Introductionmentioning

confidence: 56%

Section: Introductionmentioning

confidence: 85%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Relativisticab initiointerpretation ofL-Kvacancy sharing in ion–solid-target collisions

et al. 1995

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Azimuthal angular dependence of the K-x-ray emission in swift Ne7+-Ne collisions

Kambara

Awaya

Kanai

et al. 1991

Atomic Physics of Highly Charged Ions

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* supported by DRGIn swift near s y m m e t r i c heavy ion atom collisions the inner shell e x c i t a t i o n is w e l l described in the f r a m e w o r k of e l e c t r o n promotion b e t w e e n quasim o l e c u l a r orbitals t r a n s i e n t l y formed during the c o l l i s i o n process [1]. For K -s h e l l e x c i t a t i o n the vacancy t r a n s f e r via 2p~t-2p~-rotational coupling plays a dominating role and yields a c h a r a c t e r i s t i c dependence of the 2 p o -v a c a n c y production probability Pzpa(b) on the impact p a r a m e t e r (b). The c o n s e r v a t i o n of angular momentum, where angular momentum of the n u c l e a r motion is t r a n s f e r e d into e l e c t r o n i c angular momentum, c r e a t e s a significant shape of Pzp~(b). S y s t e m a t i c e x p e r i m e n t a l i n v e s t igations [11,2] have shown nice a g r e e m e n t with theory [3,4]. Because of the r o t a t i o n a l coupling mechanism the 2 p o -e l e c t r o n should be promoted only into the 2 p n x -o r b i t a l (its angular momentum v e c t o r is p e r p e n d i c u l a r to the s c a t t e r i n g plane). If all other 2PTt-states would be vacant, a subsequent x -r a y emission from the 2pn x into the isotropic ls s t a t e should r e f l e c t by its dipole emission p a t t e r n d i r e c t l y this s e l e c t i v e 2prrx-promotion. For heavy ions this alignment aspect has never e x p e r im e n t a l l y been i n v e s t i g a t e d . Such an e x p e r i m e n t a l i n v e s t i g a t i o n would r e q u i r e that the emitted K -x -r a y is m e a s u r e d in coincidence with the s c a t t e r i n g plane of the colliding nuclear partners. F u r t h e r m o r e we must ensure that the L -s h e l l of the emitting e x c i t e d ion was c o m p l e t e l y vacant besides the one p r o m o t e d 2p~tx e l e c t r o n . This is in g e n e r a l hard to c o n t r o l , h o w e v e r for 10 MeV Ne 7÷ on Ne by s e l e c t i o n of the high p r o j e c t i l e charge state exit channels, we are indeed able to s e p a r a t e such p r omotion channels. As e x p e c t e d for such exit channels a pronounced dipole emission p a t t e r n of K -x -r a y emission with r e s p e c t t o the s c a t t e r i n g plane has been observed.The e x p e r i m e n t was p e r f o r m e d at the RIKEN heavy ion linear a c c e l e r a t o r (RILAC). The charge state s e l e c t e d Ne 7+ beam was w e l l c o l l i m a t e d by a triple set of c o l l i m a t o r s reaching an angular d i v e r g e n c e of about 10 -4 tad. The Ne 7. beam passed a thin Ne gas t a r g e t viewed by a Si(Li) d e t e c t o r with a 12.5~ Be-window, to be able to d e t e c t the N e -K -r a y s . The s c a t t e r e d p r o j e c t i l e s were m a g n e t ic a l l y (25 ° ) c h a r g e -s t a t e s e l e c t e d and were d e t e c t e d by a t w o -d i m e n s i o n a l p o s i t i o n -s e n s i t i v e p a r a l l e l p l a t e avalanche d e t e c t o r with a wedge and stip anode. The d e t e c t o r was p l a c e d about 6 m d...

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Measurements of theK-vacancy production probability in very heavy collision systems at 1.4 MeV/N projectile energy

Liesen

Liu

Warczak

1986

Z. Physik A - Atomic Nuclei

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The impact parameter dependence of the K-vacancy production probability in 1.4 MeV/N collisions between very heavy ions and atoms has been determined by K x-rayscattered particle coincidence measurements. The results are interpreted in terms of the molecular lso-and 2pa excitation probabilities. From a comparison to two empirical models a connection between these models is obtained and the energy transfers involved are extracted.

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Systematic study of impact parameter dependent K-vacancy probabilities in near symmetric gas- and solid-target collision systems

Cited by 18 publications

References 32 publications

Relativisticab initiointerpretation ofL-Kvacancy sharing in ion–solid-target collisions

Relativisticab initiointerpretation ofL-Kvacancy sharing in ion–solid-target collisions

Azimuthal angular dependence of the K-x-ray emission in swift Ne7+-Ne collisions

Measurements of theK-vacancy production probability in very heavy collision systems at 1.4 MeV/N projectile energy

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