Cross sections for charge change in argon and equilibrium charge states of 3.5MeV/amu uranium ions passing through argon and carbon targets

Perumal, A. N.; Horvat, V.; Watson, R. L.; Peng, Yong; Fruchey, K.S.

doi:10.1016/j.nimb.2004.09.005

Cited by 38 publications

(40 citation statements)

References 20 publications

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“…The Figure shows that for a given collision energy the probability of the 12-fold and more ionization processes is too small. This result is in correspondence with the experimental data [10] available only for number of ejected electrons m ≤ 11.…”

Section: Resultssupporting

confidence: 92%

“…The corresponding experimental data are taken from the Refs. [9,10], and are in a reasonable agreement with results of our calculations.…”

Section: Resultssupporting

confidence: 90%

“…[8] is used to calculate the total and m-fold EL cross sections for U q+ ions, (q = 10, 31, 33) colliding with Ne and Ar targets at energies E = 1.4 and 3.5 MeV/u. The results are in a good agreement with available experimental data [9,10].…”

Section: Introductionsupporting

confidence: 90%

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Multiple-electron losses of highly charged ions colliding with neutral atoms

Litsarev¹,

Shevelko²

2013

Phys. Scr.

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Abstract. We present calculations of the total and m-fold electron-loss cross sections using the DEPOSIT code for highly charged U q+ ions (q = 10, 31, 33) colliding with N e and Ar targets at projectile energies E = 1.4 and 3.5 MeV/u. Typical examples of the deposited energy T (b) and m-fold ionization probabilities P m (b) used for the crosssection calculations as a function of the impact parameter b are given. Calculated m-fold electron-loss cross sections are in a good agreement with available experimental data. Although the projectile charge is rather high, a contribution of multiple-electron loss cross sections to the total electron-loss cross sections is high: about 65 % for the cases mentioned.

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Section: Resultssupporting

confidence: 92%

“…The corresponding experimental data are taken from the Refs. [9,10], and are in a reasonable agreement with results of our calculations.…”

Section: Resultssupporting

confidence: 90%

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Multiple-electron losses of highly charged ions colliding with neutral atoms

Litsarev¹,

Shevelko²

2013

Phys. Scr.

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“…2(b) [34]. The Q eq data of U in heavier gases with Z ≥ 7 are indicated by open diamonds [16,18,19,22,[35][36][37] along with the plot of the semi-empirical formula (long-dashed line) [36]. The Q eq of U in He is greater by almost 10 (Q eq =Z ∼ 0.1) when compared with those of other gases such as N 2 , etc.…”

Section: Introductionmentioning

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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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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“…A considerable amount of data can be found in literature related to studies on charge fractions after collisions of atomic projectiles with solid targets. Early work on this problem was concentrated on the analysis of charge state distributions after the transmission of fast ions through thin solid foils or through targets with atoms in the gas phase over a wide domain of projectile velocities (Garnir et al, 1996;Grande & Schiwietz, 1998;Perumal, 2005), whereas such data for scattering experiments from surfaces of solid targets are rather rare Ramana et al, 2003;Yang and Jory, 2003;Nakajima et al, 2004). In recent years, however, the impact of atomic projectiles on the surface of solid targets has been paid increased attention, and measurements of charge fractions for energetic projectiles provided the basis for a microscopic understanding of the atom-surface interaction scenario (Kimura et al, 1992;Winter et al, 1998, Wethekam et al, 2003.…”

Section: Introductionmentioning

confidence: 99%

Theoretical Interpretation of Atomic Charge Exchange between Singly Charged Helium Ions and Aluminum Foils

Mahasneh¹

2010

MAS

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An experimental method for determining the equilibrium charge state of fast helium ions backscattered by solid Al-foils has been conducted using single Silicon Surface Barrier Detector (SBD) in a post acceleration system (PAS). The charge state measurements have been conducted to cover a wide energy range of the incident singly charged helium ion He + . The detected charge states increases from 0 to +Z with the incident ion's velocity. The method consists of measuring the charge states of ions after backscattering from the Al-foil as a function of projectile velocity and also finding the charge state distributions as a function of Al-foil thickness. The measurements are conducted for two types of Al-foil, one of which is thinner (2.5, 4.0, 5.4 μg/cm 2 ) and the other of which is of the order of an equilibrium foil thickness, where thicknesses of 6.8, 8.1, 9.5, and 10.8 were used. Ratios of equilibrium charge state yields for singly to doubly ionized He ions; He +1 and He +2, were also measured. The kinematics behavior of the measured He 0 , He + and He +2 fractions is understood by the well-known Rutherford Backscattering Spectrometry technique (RBS). It has been shown that the dominant processes occurring to a fast He + ions traversing Al-foil are the capture of the electron from the Al-atom to vacant state in the ion and the stripping of the bound electron from the He + ion. The charge composition of the ion beams changes when it backscatters Al-foil, which thick enough for multiple atomic collisions, leading eventually to an equilibrium charge state distribution (ECSD). It was found that the theoretical calculations for electron-capture and loss ratios, based of semi-classical approach of Bianconi, are successful in describing the measured He ions. The satisfactory fits of the measured equilibrium charge state fractions (ECSF's) are mainly accounted to the contribution of both free valance electrons of the target and screened target nucleus in the calculation of total electron-loss cross sections. Bianconi approach is also applied to describe the measured mean equilibrium charges (MEC). The agreement between experiment and theory in this investigation is accounted to the reliability of the used post-acceleration system where all the backscattering charge-states, at certain incident ion's velocity, are separated and collected in one measurement.

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Cross sections for charge change in argon and equilibrium charge states of 3.5MeV/amu uranium ions passing through argon and carbon targets

Cited by 38 publications

References 20 publications

Multiple-electron losses of highly charged ions colliding with neutral atoms

Multiple-electron losses of highly charged ions colliding with neutral atoms

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

Theoretical Interpretation of Atomic Charge Exchange between Singly Charged Helium Ions and Aluminum Foils

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