Experimental and theoretical L-shell ionization cross sections of heavy atoms by impact of Si ions

Oswal, Mumtaz; Kumar, Sunil; Singh, U.N.; Singh, Sukhpal; Singh, Gurjeet; Singh, Karamjit; Mehta, D.; Mendez, A. M. P.; Mitnik, D. M.; Montanari, C. C.; Mitra, Debasis; Nandi, T.

doi:10.1016/j.radphyschem.2020.108809

Cited by 16 publications

(18 citation statements)

References 41 publications

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“…A semi-empirical fitted relative efficiency curve used for the present measurement can be seen in Oswal et.al. [13].…”

Section: Methodsmentioning

confidence: 99%

“…Inner shell ionization of target atoms are being carried out for a long time with light as well as heavy projectiles, for examples [4][5][6][7][8][9][10][11][12][13][14]. It has enabled the research community to study the processes like ionization, excitation, multiple ionization [15], radiative decay, Augerdecay [16], changes in atomic parameters, intrashell coupling effect (in L-and M-shell not in K-shell) [17,18], etc at different energy regimes.…”

Section: Introductionmentioning

confidence: 99%

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K-shell ionization cross sections of Cu, Zn and Ge by 3-5 MeV/U Si-ion bombardment

Singh,

Oswal,

Kumar

et al. 2021

Preprint

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The K x-ray spectra of different targets (Cu, Zn, and Ge) induced by 3 to 5 MeV/u Si projectile ions have been measured to determine the K-shell ionization cross-section. A significant difference is observed between the measurements and theoretical estimates, where the theoretical ones are about 28-35% of the experimental results. Such difference is reduced to a good extent 51-56% if multiple ionization effects are taken into account. Remaining discrepancy may be attributed to the electron capture contribution.

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“…A semi-empirical fitted relative efficiency curve used for the present measurement can be seen in Oswal et.al. [13].…”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

K-shell ionization cross sections of Cu, Zn and Ge by 3-5 MeV/U Si-ion bombardment

Singh,

Oswal,

Kumar

et al. 2021

Preprint

Self Cite

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“…From the figures, it is clear that all major L x-ray components are well resolved by the Si(Li) detector. The details about the data acquisitions and the terms related to the projectile velocity are given by Oswal et al [22].…”

Section: Experimental Details and Data Analysismentioning

confidence: 99%

“…The role of projectile charge state in this collision regime for 4-6 MeV/u is found to be negligible [22]. Integrated charge in a Faraday cup measured by a current integrator has been used to count N p (see discussion in Section VI).…”

Section: Experimental Details and Data Analysismentioning

confidence: 99%

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Understanding the L-shell ionization mechanism through osmium atoms bombarded by 4-6 MeV/u fluorine ions

Chatterjee,

Kumar,

Kumar

et al. 2021

Preprint

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The L-subshell ionization mechanism is studied in an ultra-thin osmium target bombarded by 4-6 MeV/u fluorine ions. Multiple ionization effects in the collisions are considered through the change of fluorescence and Coster-Kronig yields while determining L-subshell ionization cross sections from L-line x-ray production cross sections. The L-subshell ionization, as well as L-shell x-ray production cross sections so obtained, are compared with various theoretical approximations. The Coulomb direct ionization contributions is studied by (i) the relativistic semi-classical approximations (RSCA), (ii) the shellwise local plasma approximation (SLPA), and (iii) the ECUSAR theory, along with the inclusion of the vacancy sharing among the subshells by the coupled-states model (CSM) and the electron capture (EC) by a standard formalism. We find that the ECUSAR-CSM-EC describes the measured excitation function curves the best. However, the theoretical calculations are still about a factor of two smaller than the measured values. Such differences are resolved by re-evaluating the fluorescence and the Coster-Kronig yields. This work demonstrates that, in the present energy range, the heavy-ion induced inner-shell ionization of heavy atoms can be understood by combining the basic mechanisms of the direct Coulomb ionization, the electron capture, the multiple ionization, and the vacancy sharing among subshells, together with optimized atomic parameters.

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L-shell ionisation and X-ray production cross-sections for some low Z-elements by proton impact

Aladese

2022

Journal of Electron Spectroscopy and Related Phenomena

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Experimental and theoretical L-shell ionization cross sections of heavy atoms by impact of Si ions

Cited by 16 publications

References 41 publications

K-shell ionization cross sections of Cu, Zn and Ge by 3-5 MeV/U Si-ion bombardment

K-shell ionization cross sections of Cu, Zn and Ge by 3-5 MeV/U Si-ion bombardment

Understanding the L-shell ionization mechanism through osmium atoms bombarded by 4-6 MeV/u fluorine ions

L-shell ionisation and X-ray production cross-sections for some low Z-elements by proton impact

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