Convolution approximation for the energy loss, ionization probability and straggling of fast ions

Grande, P.L.; Schiwietz, G.

doi:10.1016/j.nimb.2009.02.017

Cited by 67 publications

(35 citation statements)

References 43 publications

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“…In this contribution, we show that for projectiles heavier than C, the theoretical approach based on the SLPA calculations is no longer adequate due to the growing influence of higher-order or nonlinear effects on the whole range of energies. We show also that the combination of a nonperturbative description, such as the convolution approximation for swift particles (CasP) model [11], with the TCS-EFSR for the valence electrons leads to a very good agreement between experiment and theory.The energy loss determinations were done by the Rutherford backscattering technique (RBS) at the 3 MV Tandetron of the Instituto de Fisica da Universidade Federal de Rio Grande do Sul, Brazil. In the present experiments, the energy range between 50 keV/amu and 1.2 MeV/amu was studied.…”

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Experimental and theoretical study of the energy loss of C and O in Zn

et al. 2011

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We present a combined experimental-theoretical study of the energy loss of C and O ions in Zn in the energy range 50-1000 keV/amu. This contribution has a double purpose, experimental and theoretical. On the experimental side, we present stopping power measurements that fill a gap in the literature for these projectiletarget combinations and cover an extended energy range, including the stopping maximum. On the theoretical side, we make a quantitative test on the applicability of various theoretical approaches to calculate the energy loss of heavy swift ions in solids. The description is performed using different models for valence and inner-shell electrons: a nonperturbative scattering calculation based on the transport cross section formalism to describe the Zn valence electron contribution, and two different models for the inner-shell contribution: the shellwise local plasma approximation (SLPA) and the convolution approximation for swift particles (CasP). The experimental results indicate that C is the limit for the applicability of the SLPA approach, which previously was successfully applied to projectiles from H to B. We find that this model clearly overestimates the stopping data for O ions. The origin of these discrepancies is related to the perturbative approximation involved in the SLPA. This shortcoming has been solved by using the nonperturbative CasP results to describe the inner-shell contribution, which yields a very good agreement with the experiments for both C and O ions. The study of the energy loss of ions in solids is a problem of interest for basic and applied research in many areas, such as ion implantation, radiation damage, and space research. Although a large number of experiments and calculations have been produced over the years, there is a demand for new data for various projectile-target combinations. Additionally, the development of a consistent theoretical framework is a subject of great current interest [1,2]. In recent years, we have performed a set of studies that combine experimental and theoretical research with the aim of providing a theoretical framework that could serve as a basis for more accurate predictions of the energy loss of swift ions in various solid materials. It is worthwhile to mention that for ions heavier than Li, the experimental stopping power data are scarce except for some particular materials (C, Al, Si, Ag, Au) [3]. In zinc, no energy loss measurements for C and O ions have been reported in the literature.In previous papers, we have studied in a systematic way the stopping coefficients for a series of ions of increasing atomic numbers: H, He, Li, Be, and B in zinc [4][5][6][7][8], and with our theoretical formulation, we have been able to explain changes in the stopping power curves, reaching a very good agreement between the experimental and theoretical results. This agreement was achieved by a detailed theoretical study of the contribution of each individual charge state of the projectile and each electronic shell of the target. This was made by separ...

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Experimental and theoretical study of the energy loss of C and O in Zn

et al. 2011

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“…Corrections due to electron binding, orbital motion, projectile screening and projectile excitation need to be applied at low beam energies [7,8].…”

Section: Bohrmentioning

confidence: 99%

Energy-loss straggling of 2–10 MeV/u Kr ions in gases

et al. 2013

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Abstract. Measurements have been performed on a time-of-flight setup at the Jyväskylä K130 cyclotron, aiming at energy-loss straggling of heavy ions in gases. Theoretical predictions based on recently developed theory as well as an empirical interpolation formula predict that straggling can be more than ten times higher than Bohr straggling in the MeV/u regime. Our measurements with up to 9.3 MeV/u Kr ions on He, N2, Ne and Kr targets confirm this feature. Our calculations show the relative contributions of linear straggling, bunching including packing, and charge exchange. Our results for stopping cross sections are compatible with values from the literature.

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“…We used two models in order to calculate the energy T(b) transferred by a SHI to a target atom which is the input parameter for the SED-model: [28,29] which gives the dependence of the energy transferred to an atom on the impact parameter.…”

Section: Multi-ionization Approximations Of Atomic Ionizations By a Shimentioning

confidence: 99%

Effect of interaction of atomic electrons on ionization of an insulator in swift heavy ion tracks

Баранов

Medvedev

Волков

et al. 2012

Nuclear Instruments and Methods in Physics Research Section B:

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a b s t r a c tEffects of applications of two different models of atomic ionizations in MC simulations describing excitation of the electronic subsystem of an insulator in tracks of swift heavy ions decelerated in the electronic stopping regime are investigated. The first mechanism is based on binary collisions of a fast projectile with atomic electrons considered as independent. The second one assumes redistribution of the energy transferred to an atom from an ion between the atomic electrons before autoionization of the excited atom. It is demonstrated that an appreciable difference occurs only in the kinetics of the most energetic electrons appeared during the ionization. This difference affects only a small fraction of the excess electronic energy in the far periphery of a track.

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Convolution approximation for the energy loss, ionization probability and straggling of fast ions

Cited by 67 publications

References 43 publications

Experimental and theoretical study of the energy loss of C and O in Zn

Experimental and theoretical study of the energy loss of C and O in Zn

Energy-loss straggling of 2–10 MeV/u Kr ions in gases

Effect of interaction of atomic electrons on ionization of an insulator in swift heavy ion tracks

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