Dynamics of solid inner-shell electrons in collisions with bare and dressed swift ions

Montanari, C. C.; Miraglia, J. E.; Arista, N. R.

doi:10.1103/physreva.66.042902

Cited by 44 publications

(28 citation statements)

References 76 publications

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“…In these experiments three kinds of ions, 1 H + , 4 He + , and 11 B + have been used. Pulse widths of 1 ns is routinely obtained, which also gives the energy resolution of the whole system.…”

Section: Discussionmentioning

confidence: 99%

“…• , the crystal direction [11][12][13][14][15][16][17][18][19][20][21][22][23], a direction with the same symmetry as the direction of the incoming beam, is seen as a dark spot. Two unwanted artifacts can also be seen.…”

Section: Angular Resolution: Channeling and Blocking Spectrummentioning

confidence: 99%

“…In MEIS measurements, the beam energy can be chosen around the stopping power maximum of the projectile to improve depth resolution. 11 The simplicity of the RBS analysis may then be maintained with an improved depth resolution and also increase the yield of backscattered ions. However, it is crucial that the energy resolution, E/E 0 , in MEIS is kept small as the energy of the probing ion decreases.…”

Section: Introductionmentioning

confidence: 99%

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New beam line for time-of-flight medium energy ion scattering with large area position sensitive detector

Linnarsson

Hallén

Åström

et al. 2012

Review of Scientific Instruments

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A new beam line for medium energy ion mass scattering (MEIS) has been designed and set up at the Ångström laboratory, Uppsala University, Sweden. This MEIS system is based on a time-of-flight (ToF) concept and the electronics for beam chopping relies on a 4 MHz function generator. Repetition rates can be varied between 1 MHz and 63 kHz and pulse widths below 1 ns are typically obtained by including beam bunching. A 6-axis goniometer is used at the target station. Scattering angle and energy of backscattered ions are extracted from a time-resolved and position-sensitive detector. Examples of the performance are given for three kinds of probing ions, 1H+, 4He+, and 11B+. Depth resolution is in the nanometer range and 1 and 2 nm thick Pt layers can easily be resolved. Mass resolution between nearby isotopes can be obtained as illustrated by Ga isotopes in GaAs. Taking advantage of the large size detector, a direct imaging (blocking pattern) of crystal channels are shown for hexagonal, 4H-SiC. The ToF-MEIS system described in this paper is intended for use in semiconductor and thin film areas. For example, depth profiling in the sub nanometer range for device development of contacts and dielectric interfaces. In addition to applied projects, fundamental studies of stopping cross sections in this medium energy range will also be conducted.

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Section: Discussionmentioning

confidence: 99%

Section: Angular Resolution: Channeling and Blocking Spectrummentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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New beam line for time-of-flight medium energy ion scattering with large area position sensitive detector

Linnarsson

Hallén

Åström

et al. 2012

Review of Scientific Instruments

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“…We have also calculated the contribution of Zn inner-shell electrons by employing the dielectric formalism through the local plasma approximation (LPA) [21][22][23]. The dielectric formalism, usually employed to deal with collisions involving solid targets, allows us to take into account the electronic response in a dynamical way.…”

Section: Theoretical Calculationsmentioning

confidence: 99%

Energy loss of helium ions in zinc

et al. 2004

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The energy loss of helium ions in zinc has been measured in the energy range from 37.5 to 1750 keV/ amu using the transmission technique and the Rutherford backscattering method. In addition, calculations using the extended Friedel sum rule, the unitary convolution approximation, and the local plasma approximation have been performed. The contributions of the inner-shell and valence electrons to the total energy loss are separately evaluated. The measurements and calculations are in good agreement over an extended range of energies, and both of them yield stopping values higher than those provided by SRIM 2003.

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“…It is noted that all energy-loss models known to us are based on the independent-electron picture, if localized electron states are considered (with the exception of Ref. [7]). The only current energy-loss theory that involves no further approximations is the atomic-orbital coupled-channel (AOCC) theory.…”

Section: Introductionmentioning

confidence: 99%

Introducing electron capture into the unitary-convolution-approximation energy-loss theory at low velocities

Schiwietz

Grande

2011

Phys. Rev. A

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Recent developments in the theoretical treatment of electronic energy losses of bare and screened ions in gases are presented. Specifically, the unitary-convolution-approximation (UCA) stopping-power model has proven its strengths for the determination of nonequilibrium effects for light as well as heavy projectiles at intermediate to high projectile velocities. The focus of this contribution will be on the UCA and its extension to specific projectile energies far below 100 keV/u, by considering electron-capture contributions at charge-equilibrium conditions.

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Dynamics of solid inner-shell electrons in collisions with bare and dressed swift ions

Cited by 44 publications

References 76 publications

New beam line for time-of-flight medium energy ion scattering with large area position sensitive detector

New beam line for time-of-flight medium energy ion scattering with large area position sensitive detector

Energy loss of helium ions in zinc

Introducing electron capture into the unitary-convolution-approximation energy-loss theory at low velocities

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