Inner-Shell Ionizations by Proton Impact

The charge state distributions of krypton ( 86 Kr) with an energy of 2.7 MeV=nucleon were measured using hydrogen (H 2 ) and helium (He) gas charge strippers. A differential pumping system was constructed to confine H 2 and He gases to a thickness sufficient for the charge state distributions to attain equilibrium. The mean charge states of 86 Kr in H 2 and He gases attained equilibrium at 25.1 and 23.2, respectively, whereas the mean charge state in N 2 gas at equilibrium was estimated to be less than 20. The charge distributions are successfully reproduced by the cross sections of ionization and electron capture processes optimized by a fitting procedure.

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“…These models were proposed first by Gryzinski [50] and Garcia [51]. Additional work toward their development was performed by Vriens [52].…”

Section: A Ionization Reactionsmentioning

confidence: 99%

Charge state distribution ofKr86in hydrogen and helium gas charge strippers at2.7 MeV/nucleo

Kuboki

Okuno

Hasebe

et al. 2014

Phys. Rev. ST Accel. Beams

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“…For ion velocities ~ Ve' this decreases much more slowly with decreasing v than the upper limit in (14). The main domain of applicability of the BEA appears to be in innershell excitation by moderate-velocity light ions (GARCIA, 1970), in particular with regard to indirect processes (e.g. emission of Auger electrons).…”

Section: Primary Ionization Processesmentioning

confidence: 99%

Electron Emission from Solids During Ion Bombardment. Theoretical Aspects

Sigmund

Tougaard

1981

Springer Series in Chemical Physics

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This contribution is devoted to the theory of ion-induced electron emission from solids, with the emphasis on bulk as opposed to surface processes. With the aim of describing yields and energy spectra of emitted electrons, we discuss pertinent elementary processes, l.e., primary and secondary excitation, electron transport, and escape. I'lith regard to the primary process, proper distinction is made between high-and low-velocity ions, and reference is made to the physics of ion-atom collisions as well as to dielectric stopping theory. The discussion of secondary excitation makes reference to the theory of ionization cascades as well as atomic recoil cascades. Electron transport is considered first in an infinite medium and subsequently, within the diffusion approximation, in a semi-infinite medium. Special attention is paid to pertinent electron mean free paths, inelastic processes being estimated on the basis of the free-electron-gas model of a solid. We find that the neglect of elastic scattering of electrons in most existing treatments of electron emission has severe consequences on the interpretation of structure in measured electron spectra. Comments are made on the escape depth of electrons.

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“…There are different theoretical approaches developed to describe the inner shell ionization process by charged particles, namely the plan wave Born approximation-PWBA- [1], the semi-classical approximation -SCA [2], and the classical approach, known as the binary-encounter approximation-BEA- [3] and the ECPSSR model [4], which is being the most advanced approach based on the PWBA theory to account for energy (E) loss and Coulomb (C) deflection of the projectile and the perturbed stationary state (PSS) and relativistic (R) nature of the target's inner-shell. Although this approaches, the theoretical predictions deviate significantly, especially at low energies, from the experimental values.…”

Section: Introductionmentioning

confidence: 99%

Z-dependence analysis of M x-ray production cross sections for heavy elements with 60≤Z≤90 by protons impact

Deghfel¹,

Kahoul²,

Nekkab³

2015

AIP Conference Proceedings

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Inner-Shell Ionizations by Proton Impact

Abstract: of such e q e r i n e n t s i s also discussed. Determination of fluorescent y i e l d s by meanshttps://ntrs.nasa.gov/search.jsp?R=19700002199 2018-05-13T00:46:24+00:00Z

Cited by 302 publications

References 12 publications

Charge state distribution ofKr86in hydrogen and helium gas charge strippers at2.7 MeV/nucleo

Charge state distribution ofKr86in hydrogen and helium gas charge strippers at2.7 MeV/nucleo

Electron Emission from Solids During Ion Bombardment. Theoretical Aspects

Z-dependence analysis of M x-ray production cross sections for heavy elements with 60≤Z≤90 by protons impact

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