M-shell ionization of heavy elements by 0.1–1.0 MeV/amu ^1,2H and ^3,4He ions

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M. Pajek, D. Bana

, J. Braziewicz, and M. Czarnota
Institute of Physics, witokrzyska Academy, 25-406 Kielce, Poland

A. Bie

kowski, M. Jaskó

a, and A. Korman
The Andrzej Soltan Institute for Nuclear Studies, 05-400 Otwock-wierk, Poland

D. Trautmann
Institut für Theoretische Physik, Universität Basel, CH-4056 Basel, Switzerland

G. Lapicki
Department of Physics, East Carolina University, Greenville, North Carolina 27858, USA

Received 3 October 2005; published 17 January 2006

TheM-shell ionization in high-Z atoms by low-energy light 11 H, 12 H, 23 He, and 24 He ions have been studied systematically in theenergy range 0.1–1.0 MeV/amu in order to verify the available theoreticalapproaches describing the M-shell ionization by charged particles in asymmetriccollisions. The present low-energy data, combined with our earlier resultsreported for M-shell ionization by hydrogen and helium ions forhigher energies, form a systematic experimental basis to test thetheoretical predictions of M-shell ionization based on the plane-wave Bornapproximation (PWBA), the semiclassical approximation (SCA), and the binary-encounter approximation(BEA). In the PWBA based approaches the energy loss (E),Coulomb deflection (C), perturbed stationary state (PSS), and relativistic (R)effects were considered within the ECPSSR theory and its recentmodification, called the ECUSAR theory, in which a description ofthe PSS effect was corrected to account for the united-and separated-atom (USA) electron binding energy limits. In the SCAcalculations with relativistic wave functions the binding effect was includedonly in the limiting cases of separated-atom and united-atom limits.Possible contribution of the electron capture, multiple ionization, and recoilionization to the M-shell vacancy production, which is dominated forlight ions impact by direct single ionization process, are alsodiscussed. The universal scaling of measured M-shell x-ray production andionization cross sections was investigated in detail. Using the presentdata the isotopic effect has been studied by comparing themeasured M-shell ionization cross-section ratios for equal-velocity hydrogen 11 H and 12 H as well as helium 23 He and 24 He isotopes. Inaddition, the ratios of measured ionization cross sections for Hand He were used to investigate the role of thebinding effect. The present results are of practical importance forthe application of particle-induced x-ray emission technique in trace elementstudies.

URL:	http://link.aps.org/doi/10.1103/PhysRevA.73.012709
DOI:	10.1103/PhysRevA.73.012709
PACS:	34.50.Fa 34.50.Fa Electronic excitation and ionization of atoms including beam–foil excitation and ionization YEAR: 2006
KEYWORDS:	ionisation, binding energy, polarisation, isotope effects, electron capture, relativistic corrections, hydrogen ions, helium ions, X-ray emission spectra, atom-ion collisions

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