Saturation in the K-shell Excitation of 120 MeV S14+ Ions in Interaction with Gas Targets

Tiwari, Utkarsh; Saha, A.; Dhal, B.B.; Tribedi, Lokesh C.; Kurup, M.B.; Tandon, P.N.; Gulyás, László

doi:10.1238/physica.topical.080a00393

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“…The first-Born approximation (FBA) predicted Z 2 t dependence and failed to explain the observed saturation effect in the excitation cross section. The Schwinger variational principle gave an impressive agreement with the data at high-as well as low-energy experiments [4][5][6][7]. The symmetric eikonal continuum distorted wave (SECDW) calculation [8] is only high-energy approximation and breaks down at low velocity [6,7].…”

Section: Introductionmentioning

confidence: 56%

“…The Schwinger variational principle gave an impressive agreement with the data at high-as well as low-energy experiments [4][5][6][7]. The symmetric eikonal continuum distorted wave (SECDW) calculation [8] is only high-energy approximation and breaks down at low velocity [6,7]. Sigaud et al [9] have observed the saturation in the projectile electron loss cross sections for He + ions as a function of target atomic number.…”

Section: Introductionmentioning

confidence: 67%

“…The multiple processes, which also contribute to the excitation cross section, have also been separately identified. Tiwari et al [6,7] studied the projectile energy dependence for the K-shell excitation cross section of 45-110 MeV Si 12+ and 120 MeV S 14+ ions with velocities between 8 and 12.5 au in collisions with He, N 2 , Ne, Ar and Xe targets. A striking feature of all these measurements is the observed saturation in the excitation cross section as target atomic number Z t increases.…”

Section: Introductionmentioning

confidence: 99%

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Saturation effect in projectile- and target- x-ray production in collisions between 2.5 MeV/u highly charged Cu ions and gaseous targets

Kumar

Misra

Kelkar

et al. 2005

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

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L x-ray production cross sections have been measured for highly charged 2.5 MeV/u Cuq+ (q = 20–26) ions colliding with H2, Ne, Ar, Kr and Xe target atoms. The observed Cu L x-rays are due to the excitation and electron-transfer processes. The charge state dependence of the projectile L x-rays has been studied with Ar and Kr targets. We have derived the subshell resolved K-L1, K-L2 and K-L3 electron-transfer cross sections from the measured Ar K x-ray yields as a function of L vacancies in Cu ion. The measured projectile L x-ray production cross sections arising from the excitation and electron capture are found to saturate as target atomic number Zt increases. Similarly, a saturation has also been found in the Ar K-shell ionization cross sections as a function of Zp.

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