| 1. |
- Vockenhuber, C., et al.
(författare)
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Energy loss and straggling of MeV Si ions in gases
- 2017
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Ingår i: Nuclear Instruments and Methods in Physics Research Section B. - : ELSEVIER SCIENCE BV. - 0168-583X .- 1872-9584. ; 391, s. 20-26
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Tidskriftsartikel (refereegranskat)abstract
- We present measurements of energy loss and straggling of Si ions in gases. An energy range from 0.5 to 12 MeV/u was covered using the 6 MV EN tandem accelerator at ETH Zurich, Switzerland, and the K130 cyclotron accelerator facility at the University of Jyvaskyla, Finland. Our energy-loss data compare well with calculation based on the SRIM and PASS code. The new straggling measurements support a pronounced peak in He gas at around 4 MeV/u predicted by recent theoretical calculations. The straggling curve structure in the other gases (N-2, Ne, Ar, Kr) is relatively flat in the covered energy range. Although there is a general agreement between the straggling data and the theoretical calculations, the experimental uncertainties are too large to confirm or exclude the predicted weak multi-peak structure in the energy-loss straggling. (C) 2016 Elsevier B.V. All rights reserved.
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| 2. |
- Whitlow, Harry J, et al.
(författare)
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Measurements of Si ion stopping in amorphous silicon
- 2002
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Ingår i: Nuclear Instruments & Methods in Physics Research. Section B: Beam Interactions with Materials and Atoms. - 0168-583X. ; 190:1-4, s. 84-88
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Tidskriftsartikel (refereegranskat)abstract
- The stopping of Si-28 ions in polycrystalline Si foils has been measured over the energy range 0.1-3.3 MeV per nucleon. For the low energy interval (0.1-0.5 MeV per nucleon), time of flight-energy elastic recoil detection analysis method was used, whilst for the high energy region (1.2-3.3 MeV per nucleon) the energy loss in the same foil was measured using a Si p-i-n diode with the Si-28 ions directly incident on the foil following acceleration. Below the stopping maximum the results are in good agreement with literature data based on Doppler shift measurements of short nuclear lifetimes but are about 20%, smaller than the SRIM prediction. Above the stopping maximum the data are in agreement with SRIM within the limits of statistical uncertainty.
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| 3. |
- Timmers, H, et al.
(författare)
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Threshold stoichiometry for beam induced nitrogen depletion of SiN
- 2002
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Ingår i: Nuclear Instruments & Methods in Physics Research. Section B: Beam Interactions with Materials and Atoms. - 0168-583X. ; 190, s. 428-432
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Tidskriftsartikel (refereegranskat)abstract
- Measurements of the stoichiometry of silicon nitride films as a function of the number of incident ions using heavy ion elastic recoil detection (ERD) show that beam-induced nitrogen depletion depends on the projectile species. the beam energy, and the initial stoichiometry. A threshold stoichiometry exists in the range 1.3 > N/Si greater than or equal to 1, below which the films are stable against nitrogen depletion. Above this threshold, depletion is essentially linear with incident fluence. The depletion rate correlates non-linearly with the electronic energy loss of the projectile ion in the film. Sufficiently long exposure of nitrogen-rich films renders the mechanism, which prevents depletion of nitrogen-poor films, ineffective. Compromising depth-resolution. nitrogen depletion from SiN films during ERD analysis can be reduced significantly by using projectile beams with low atomic numbers. (C) 2002 Published by Elsevier Science B.V.
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| 4. |
- Weijers-Dall, T D M, et al.
(författare)
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Measurements of the stopping forces for heavy ions in Ge, Ag and Au using novel 'polka-dot' detectors
- 2006
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Ingår i: Nuclear Instruments & Methods in Physics Research. Section B: Beam Interactions with Materials and Atoms. - : Elsevier BV. - 0168-583X. ; 251:2, s. 352-360
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Tidskriftsartikel (refereegranskat)abstract
- Measurements of the stopping forces for C-14, N-14 and O-16 ions in Ge and Au, for N-14 and F-19 ions in Ag, as well as for F-19 ions in Au have been made, respectively. A novel technique, reported recently, using PIN diodes coated directly with the stopping medium in a polka dot pattern was used. This provided a set of precise, self-consistent measurements on the same stopping medium. Results show small but significant deviations from SRIM stopping predictions and are also compared to a recently-developed empirical stopping force predictor.
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| 5. |
- Winzell, T., et al.
(författare)
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Scanning mu-RBS characterisation of local loading effects of non-selectively epitaxially grown SiGe thin films
- 2001
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Ingår i: Nuclear Instruments and Methods in Physics Research Section B. - 0168-583X .- 1872-9584. ; 179:1, s. 121-125
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Tidskriftsartikel (refereegranskat)abstract
- Scanning microbeam Rutherford backscattering spectrometry (mu -RBS) has been employed to investigate local loading effects of non-selective epitaxial growth (NSEG) of SiGe on Si in structures consisting of apertures in an SiO2 mask. The structure sizes were 22 mum x 22 mum. 42 mum x 42 mum, 82 mum x 82 mum and 500 mum x 2000 mum. From the measured thickness and Ge content, it was concluded that in NSEG local loading effects for the structure sizes used are small or absent.
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| 6. |
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| 7. |
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| 8. |
- Persson, L., et al.
(författare)
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Separation of mass-overlapped time of flight-energy elastic recoil detection analysis data using Ryan and Jamieson's dynamic analysis method
- 2001
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Ingår i: Nuclear Instruments and Methods in Physics Research Section B. - 0168-583X .- 1872-9584. ; 179:3, s. 403-411
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Tidskriftsartikel (refereegranskat)abstract
- Time of flight-energy (ToF-E) elastic recoil detection analysis (ERDA) data often contains mass signals with considerable overlap from adjacent isotopes in the mass-energy plane. An evaluation has been carried out of the suitability of the dynamic analysis method proposed by Ryan and Jamieson to decompose elemental signals with overlapping mass. This method is shown to work very well on generated test data and the result when it was applied to experimental data appears quite promising. Very accurate mass calibration and lineshape determination was found to be a prerequisite for the application of the method.
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| 9. |
- Timmers, H, et al.
(författare)
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Energy loss measurements for mass-14 ions using a patterned stopping medium on a PIN diode
- 2004
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Ingår i: Nuclear Instruments & Methods in Physics Research. Section B: Beam Interactions with Materials and Atoms. - : Elsevier BV. - 0168-583X. ; 219-20, s. 263-267
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Tidskriftsartikel (refereegranskat)abstract
- A new experimental technique to measure stopping forces for swift heavy ions was tested and has been found effective. A commercial PIN photodiode was coated with a patterned stopping medium of gold. This allowed the simultaneous detection of stopped- and reference-ions of C-14 and N-14 in the energy range E = 6.4-10.4 MeV. The stopping forces of these ions in gold have been measured with excellent accuracy. They are up to 10% larger than expected from present tabulations. It would be straightforward to use the same modified PIN diode in other experiments providing direct comparisons for an identical stopping medium.
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| 10. |
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